What amp would you recommend for someone with a Fender Strat HSS MIM
for the NFG, Sum 41 and Blink-182 sound.

Budget of £600
Willing to go used
Will be gigging

Fender Stratocaster HSS
Vintage V99CS
Eastwood Acoustic

Amps and Pedals
Blackstar HT-5R Stack
Digitech Bad Monkey
Korg PitchBlack

Look for a used JCM900. It's the one thing they do really well and they are the cheapest flagship Marshall on the market. They haven't held their price because they are no good for anything but punk unless you mod them.
Gilchrist custom
Yamaha SBG500
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100

Cathbard Amplification
My band