Some more new Amex offers today via my online account. The best to me look to be:
Spend £15 or more, get £5 back
Valid twice per Card
Spend £100 or more and get £30 back
Spend £100 or more, get £30 back
Note - no links for non Amex issused Amex cards yet (from TSB, Lloyds, MBNA and Barclays), but keep an eye on https://network.americanexpress.com/connect/uk/en/secure/default.html
I'll update this thread if/when they become available.
I think all offers should be good for giftcards. The Cineworld one could be combined with their Xmas gift box 'giftcard' - http://www.hotukdeals.com/deals/cineworld-christmas-giftbox-25-cinema-29-50-delivered-2539512
If you have 2 Amex cards with this offer even better as you could add the Xmas giftbox in store (£25) plus a £5 giftcard for the total of £20 after the cashback.