Hi i mostly play pop/punk classic rock and rock and ive got around £400 to spend on a new amp i don't know whether to buy an amp combo or a Cabinet and a head could you advise me on some quality amps in this price range.
There's one thing you've missed - are you wanting a gig-worthy amp or just something to use at bedroom sort of volumes?
Rig Winter 2017:

Fender Jazzmaster/Yamaha SG1000
Boss TU-3, DS-2, CS-3, EHX small stone, Danelectro delay
Laney VC30-112 with G12H30 speaker, or Session Rockette 30 for smaller gigs
Elixir Nanoweb 11-49 strings, Dunlop Jazz III XL picks
Shure SM57 mic in front of the amp
You may be able to find a Marshall JCM900 combo in that range if you're lucky. If you can, that' the way to go.
There are very few half stacks (Head + Cab) in that price range, if any. Unless you were very lucky and got a great deal used.
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