Just v briefly, I signed up for sun plus (kept seeing adverts) for £1 on the promise of £20 morrisons voucher. Thought it was worth a try and on that basis, signed up for my husband and 19 year old daughter too. Within days we all got £20 vouchers and a few days later we all received another £10 - really don't know why - giving me a total of £90 morrisons vouchers. I then cancelled our membership, which had to be done at least 5 days before the second payment of £8 something and we are £87 better off. Just mentioning in case others want to do the same.