The London Stock Exchange is one of the most prominent stock markets in the world, and as with every exchange, the LSE has a number of indices to show how the UK stock market is performing. The main one of these is the Financial Times Stock Exchange 100 (FTSE 100). You can call it the Footsie – everyone does. As the name suggests, the FTSE 100 takes the 100 companies with the biggest market capitalisation…