Cashplus offer a credit builder option as long as you sign up to 12 months of their pay monthly option which costs around £4.95.

You do not need to use the card or load more funds on, simply put £60 on it and it will automatically be debited. There is a thread on moneysavingexpert about it.

Hi -- Most prepaid cards are loaded with your own funds, and no money is actually being borrowed from the bank. Therefore, unlike a credit card, loan or overdraft agreement, no information is exchanged with credit bureaus such as Experian or Equifax.

However there are a few prepaid cards that have started to offer this if you Google "prepaid cards" you will find details.