Judging by my current outgoings:
I’d like to see if we can get cashback on fuel, although i’m not sure this is possible. Morrison’s/Shell/ASDA/etc.
Othe nice retailers include the standard UK supermarkets, also Aldi if they include anything similar?
High chain bars/restaurants? i.e Revolutions/Nandos (although i don’t go often) are a few to name as examples. Wetherspoons etc?
Subscription services such as Spotify/Netflix?
Insurance companies - Car/Gadget/Home (in that order 
)
Phone companies (EE, Vodafone etc.)
TV/Broadband Providers (Sky, Virgin, BT)
Let’s see what happens!