Here is the Santander 123 Current Account web page
http://www.santander.co.uk/uk/current-accounts/123-current-account
I also have a Santander Regular saver account which is paying me 5% but I can only pay in £200 a month.
I also have a Nationwide Regular Saver account which is giving me good interest and I can put £500 a month in that.
I fact many banks have current accounts that pay better interest that most ISAs so it is worth opening up a number of current accounts and spread your money rather than just one ISA (I have 3 current accounts all paying me good interest, better than ISA interest).