Went to go and use my double up voucher for Sainsbury's today (which I got a week ago) expecting the shelves to be cleared, but was pleasantly surprised with the stock and the number of staff present to help!
So I used a £40 voucher to buy dh a shirt and a jumper (that he had his eye on) and a couple of pairs of leggings for me). Only had to pay £4 in the end.
Then as I was leaving, I thought I'd double up again but this time for seasonal. So I had a £20 voucher and used it to pay for some fairy lights which were bang on £20, so no extra cost.
Now I don't have 2 nectar points to rub together! 
I'd better get saving again for next year!