If you look at the money section of the website you can get an indication of the best account for your own needs. At the moment it would appear that Birmingham Midshires are offering the best term (1 year) at 7.17% APR which I am about to invest in.
There are no secret little accounts that only get whispered about in this forum, and if there were, they probably wouldn't be worth looking at.
Remember there is no such things as no risk savings, just calculated savings using the FSA guaranteed scheme.