No, we already have accounts with them so no catch.
The only thing I can think of ironsky is that if you have an account somewhere else which is about closed you can take the details to them and one of the 'switching team' closes it and maybe opens an account with them?
As we already have accounts with the H we didn't have to do that.
I'm only stabbing a guess as hubby went in alone as I had other things to do.
The £100 is gratefully received anyway