Besides the size of London as a city, there are a couple of other good reasons to buy an Oyster card if you’re visiting the UK capital; taxis can be extremely expensive, especially with the current unfavourable exchange rate, and don’t forget rush hour traffic! Fortunately, London has a top notch public transport system with plenty of options for getting around, including buses, the underground, trams and trains, and depending on how long you are in the city, buying a visitor’s Oyster Card is the way to go. This pay-as-you-go smart card is accepted virtually everywhere, it discounts public transport trips by up to 50 per cent including riverboats, and it’s price capped – travel as much as you like but never use more than certain amount of credit per day in central London. Other perks are that you can top it up when you need to at any tube station, or at thousands of shops across London, thus avoiding the need to queue for tickets, which can be a huge time saver during peak travel times. It also comes with exclusive offers and discounts at over 25 leading London restaurants and shops. To use your Oyster card, just place it on the yellow button at the ticket gates of tube and rail stations, and at the entrance of buses. As for what value of card to get, this largely depends on how many days you are visiting the city, and whether or not you will be using the card to travel to and from the airport. If you’re travelling with kids, under 11s travel free, but children older than this will need their own travel ticket. Oyster cards can be used on the London Underground, overground and National Rail trains in London, London buses, South London trams, the Docklands Light Railway, the Thames cable car, and you can get a 10 per cent discount on Thames Clipper river boats. To buy a traveller’s Oyster card you can buy on arrival, or pre-purchase at VisitBritain’s online shop.