**** update ****
result !
well my reply 10 minutes ago was before i checked my emails.
this is part of the email that they sent me:
"As it is clear from your correspondence that you only required one policy, I have arranged for one to be cancelled and a payment of £12.60 to be returned to you. This will take two working days to be credited to your debit/credit card.
I trust that this now resolves this matter for you and can confirm that we are now closing our file. "
I just checked my online banking and the money has been refunded into my account so fair play to NU for sorting it out so fast ! didn't really think it would happen and i didn't even have to ring them so nice one 
Thanks for the offer Becca and good to see companies caring about their reputations but it seems like your colleagues are also on the ball 
Cheers