I just checked again and you only get £5 back if you open a current account and meet certain conditions. You can certainly join Blue Rewards and link it to that savings account, but you won't get £5 back a month that way. You'll earn interest sure but I think there are better options available for those with small amounts to save.
Ah okay. Always had a current account with them. Far too much in it currently not earning so stuck the full 5% amount in the Rainy Day Saver and hoping RBS confirm my account details for the 5.9% ISA I mentioned - had a online request on Tuesday for my driving licence and the taking of a photo via the mobile to prove I was a living person!