Quite a few discounts going with added cashback for retailers including Tesco, Tesco direct & Boots. I've listed them below, hope this helps.
Tesco direct - Save £20 when you spend £100 or more on electronics + 1.5% cashback.
Boots - Save £10 when you spend £90 + 8% cashback (expires 14 December)
Tesco - £15 off first grocery shop over £60 + £5 cashback
Rakuten.co.uk - £10 off £40 spend with our code + 8% cashback (expires 14 December)
The Book People - 10% off when you spend £25 or more + 3% cashback
The White Company - Get 20% off when you spend over £75 + 5% cashback
Hotel Chocolat - 10% off orders with our code + 10% cashback (expires 21 December )
H.Samuel - 5% off full price items with our code + 10% cashback (expires 14 December)
Feel free to add more if you wish and Merry Christmas! :)