Various indices, published by the Financial Times, showing the movement of share prices of the companies which are included in any particular index.
The FTSE100 index shows the movement in share prices of the top one hundred companies (by capital value) listed on the London Stock Exchange.
Other FTSE indices include the FTSE all-share index (which includes all the shares listed on the London Stock Exchange). There is also a range of FTSE indices for UK Gilts.