I'm a nerd for this shit and saw this offer yesterday.
Another tip is if you get one of those 'Spend £60 to get £8 off your shopping' coupons in Morrisons, they work on gift cards. Whenever I get one of those I instantly get a £100 Amazon voucher with it because I do 90% of all my shopping with Amazon, so to me that's like a free £8, plus I get morrisons loyalty points, plus I use a cashback credit card.
Likewise, if you are about to buy something online, you can often get an unwanted online gift voucher for a few % off cost value here
https://www.zeek.me/Combine that with quidco and you are laughing (at a very small victory).