There's no reason to be in London and not meet a girl if you want to. They're everywhere and the ability to meet them is there if you try. Whether you live in London or you're just visiting, with a little know-how of where to meet girls and what to say, you can become acquainted with one or more in no time.
Join a socializing website based in London. Socializing sites, such as City Socialising or Meetup, are different than dating websites because people are looking to get together to visit different places, become friends and hang out but not necessarily get involved romantically although the opportunity is there. It provides a no-pressure atmosphere to connect with a girl without immediate face-to-face contact or a lot of awkwardness. You can choose which girl to stop talking to and which one to ask to spend time with in person.
Shop in one of London's popular clothing stores. The idea may seem less than exciting, but London is known for big name stores and fantastic clothing; with a setting like that there will undoubtedly be plenty of girls around. Some popular streets on which to shop include Carnaby Street, Oxford Street and Regent Street. Take the opportunity to buy new clothes and ask for a girl's advice on which would look best on you and what she recommends. After, ask her if you can repay her by buying her coffee.
Go to a pub if you're 18, which is London's legal drinking age. A couple of pubs to consider are the White Horse Pub on Parson's Green or The Spice of Life. Even if you are by yourself, buy some food and enjoy the atmosphere. It's a casual environment where you can easily meet a girl, whether you're a tourist or a local, especially since everyone at a pub is typically in high spirits. If you are a tourist or are new to the area, ask a girl for a recommendation of what type of beer to get, then buy one for her when you get your own.
Go to one of the many festivals that London has throughout the year. The large group of people leaves many opportunities to find a girl that catches your eye. Two festivals to consider are the Taste of London in Regent's Park and The Notting Hill Carnival, which takes place each August Bank Holiday. One way to start a conversation with a girl is to ask her what the schedule of the festival is or where a certain booth or event is located. It leaves opportunity to continue the conversation and spend time with each other for the rest of the festival.
Visit one of London's tourist destinations. This works best if you are actually a tourist and you legitimately want to learn more about the location. Two of the best tourist attractions in London to check out include Big Ben and Buckingham Palace. Ask a girl that's passing by how to locate an entrance, how to get to another destination or if she knows a specific piece of information about the location. If she is a local, she may be happy to help you; if she's also a tourist, it could be a chance to find out the information together.