Don't make the same mistake I did, and use the separate 1911 site (1911census.co.uk - operated by findmypast): you will be charged, even though credits purchased through findmypast are applicable to both sites. World Cup free access to the 1911 Census is only available directly though the findmypast site. Having said that, the nice people at findmypast did re-credit my account as a good will gesture.