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London is graced with a mild climate and, as such, can be visited at any time of the year. However, a few things need to be considered. Most of the royal palaces and residences, like the State Rooms at Buckingham Palace, are only open to the public during the summer months. Many of the city's most important festivals, like the British Summer Time Music Festival, also take place during this time. Late June to mid July is also when some of the best sales are on in shops around the capital. Spring is also a good season for a visit, since the weather is generally good and finding accommodation is both easier and cheaper (high season in London means a lot of tourists). And if you're not too bothered about the grey weather, then low season (January and February) can be a good option too, when there are fewer tourists and prices are lower.

London Heathrow Airport is one of the busiest airports in the world, with five terminals. There are various ways to travel from Heathrow Airport to your destination. The cheapest and most versatile way of getting to and from the city centre to Heathrow is by tube. The fastest way is the dedicated airport train — the Heathrow Express — which takes just 15 minutes from Heathrow to Paddington Station and runs every 15 minutes.

London Gatwick Airport is the second largest airport in the UK (Heathrow Airport is the largest), with two terminals: North and South. The fastest route from the airport into Central London is via the Gatwick Express, with trains departing every 15 minutes. The non-stop journey to Victoria Station takes 30 minutes. Try the trip planner on the official website to see which of the many transportation options works best for you.

London Stansted Airport is the third busiest airport in the UK, and many low-cost airlines serving Europe and the Mediterranean operate from here. On the Stansted Express you can reach Liverpool Street station in 47 minutes. Trains run every 15 minutes. You can see the full up-to-date list of transportation options on the official website.

The Docklands Light Railway (DLR) serves East London and connects with the Tube network at Bank, Tower Gateway (Tower Hill), Shadwell, Stratford, Bow, Heron Quays, Canning Town and Canary Wharf. It also connects to the Emirates Air Line cable car at Royal Victoria. Fares are the same as on the Tube, and the DLR runs from 5:30am to 12:30am Monday to Saturday and from 7am to 11:30pm on Sunday. Both Oyster card and Travelcard holders can use the DLR.

Travel with ease along the Thames on board a river bus. There are six different routes that all stop at destinations along the riverbank between Putney and Woolwich Arsenal. Popular services include the Thames Clippers route between Hilton London Docklands Riverside and Canary Wharf, the Tate-to-Tate boatride between Tate Britain and Tate Modern, and the journey between London Eye and Greenwich village. Depending on the service you'll be able to buy your ticket either before boarding or on board. Discounts are available when using Travelcards and Oyster cards.

As well as the Underground, London has its own local train network, which connects to the Tube at many points. The main train operators serving London are Silverlink, First Capital Connect, SouthEastern Railway, Southern Railway, London Overground and Greater Anglia. These local lines are, in turn, connected to the national rail network and the Eurostar. You can use your Oyster card on all trains operating within Zones 1-9, with the exception of Heathrow Express and a few other select services. Several different railcards are available too, providing discount fares to their holders.

London's tram network, Tramlink, was introduced in the year 2000 and it runs in specific parts of South London — between Wimbledon, Croydon, Beckenham and New Addington. Trams run approximately every seven minutes to New Addington and every 10 minutes to Wimbledon, Elmers End and Beckenham Junction during the day from Monday to Saturday. If you're using an Oyster card, all you have to do is 'touch in' when you get on the tram. Seven-day, one-month and annual bus passes are available. Cash is no longer accepted in buses and trams. You can pay by tapping your contactless bank payment card.

Postage stamps are available across London at post offices, newsagents and supermarkets. To post a package or small souvenirs, drop into a post office — you can find your nearest branch on their official website. Post offices are generally open Monday–Friday from 9 am to 5:30 pm and Saturday from 9 am to 12:30 pm.

Whether you need to buy over-the-counter medication or collect a prescription, there are plenty of pharmacies all over the capital. Boots and Superdrug are two big chemist chains. You will also find pharmaceutical products at some of the larger supermarket branches.

The international dialling code for the UK is +44 or 0044, which replaces the first 'zero' of the phone number. So, for example, to call the number 020 7946 0000 from abroad you would dial +44 20 7946 0000. The area codes for London are (020) 7, (020) 8 and (020) 3. If you're dialling a London number from another fixed phone line within Greater London you don't need to dial the '020' before the number, just the rest of the number starting with 7, 8 or 3.

Electrical appliances are connected to the UK mains supply using a three-pin plug known as plug type G. The sockets come with on-and-off switches, unlike in many other countries. The average voltage of a UK power socket is 230V or slightly higher, so check the voltage of your device before plugging it in. Voltage adaptors and convertors are available from London airports and high-street electrical chains such as Argos or Curry's.

FAQ – What is the best way to explore London? London is an extremely walkable city and most locals rely on public transportation to get around. As a tourist, you have a lot more to see when you are travelling overground, so consider picking busses and trams over the Tube just for that reason. Seeing London from the river is a great opportunity to understand the city’s geography and get away from the crowds. Remember to carry comfortable walking shoes, some sort of rain protection and don’t forget about sun cream. An Oyster card is your best tool for shrinking distances in this huge city, so get one as soon as possible. – How many days in London is enough? While you can see most of the main bucket list sights in London in a couple of days, spending at least 3-4 days in London is the best way to do this incredibly diverse city justice. You’ll have enough time to get acquainted with the city and go beyond the most obvious sight. Save a day to do something that speaks to you and your interests in particular. – Where can I get an Oyster card? An Oyster card is an essential tool for every Londoner. You can buy one at the Oyster ticket stops in many newsagents, at all Tube, London Overground, most TfL Rail and some DLR stations. Visitor Centres sell them as well. The card Oyster itself costs £5 and you can recharge it in all the same places where you can buy them, plus through the TfL Oyster and contactless app. – What’s the tipping culture in London? It is customary to leave 10–15% of the bill when eating out. Many restaurants will add a 12.5% service charge, especially if you’re dining out with a large group. Check your bill if you don’t want to tip twice. You can also ask for the service charge to be removed if you found the service to be completely unacceptable. – Is London a safe city? As most big cities, London does have a higher crime rate. According to the Economists Safe Cities Index, London is the 15th safest city in the world (tied with San Francisco). – Is it safe to walk around London at night? London streets at night are generally safe, but do remember that public transport doesn’t run all night — you might be in for a very long walk to your hotel or a potentially costly cab ride. – Where is the best place to stay in London? London has many neighbourhoods to choose from, so spend some time researching what personalities each one has. Price is another important consideration, of course. Brixton is a great residential area, known for its diversity, shops and street markets. Quite hip, but that also means it can get loud. Mayfair is right next to Hyde Park. Park yourself here for old British architecture and cute boutiques. The prices are somewhat high and Mayfair doesn’t have the best airport connections. Shoreditch is a hipster paradise with excellent coffee shop culture — great for digital nomads. Shoreditch is not the most polished neighbourhood, though. Almost all neighbourhoods in London are very safe, so don’t make that your main concern. Nightlife areas like Camden, West End and Deptford can turn a bit rowdy and loud at night, but you’ll be in the middle of the action. – Is London really always rainy and grey? People tend to exaggerate. London does have decent weather, with full on sunny days. The best time to visit to avoid crowds and stay dry is early summer or early fall. Bring a jacket for the nights, even in the summer. – What should I pack for my trip to London? London is great for shopping, so don’t worry too much about forgetting things at home. To stay comfortable, you’ll definitely need a pair of good walking shoes. A water-resistant jacket won’t hurt either. And do bring your favourite going out outfit for the weekend!