That was for their general terms and conditions, the money has to come from a cheque in your name to verify your identity (the account can normally be opened with £1). However for this promotion you have to pay a minimum of £1000 in to qualify for the £50.
Hope that helps
Ian
Would also like to make people aware of this discussion I found on MSE: http://forums.moneysavingexpert.com/...ing+join+%A325 seems to show that they are only targeted marketing and these offers will only apply to certain people, however their T+C's are a bit nondescript... but the CS team seem to say they will be honoring it (only time will tell) also just a note, this seems to be an ongoing offer as they have done a similar one before.