I haven’t lived there for quite a while, but if anything it’s got better since I left. Norwich certainly has no shortage of good places to eat.
I still have family in that part of the world: let me see if they have any recommendations.
Quick tip on Thetford: the FC parking is expensive. Fine if you have kids as there’s loads of brilliant things for them to do at High Lodge, but if you’re planning to walk I’d go to Brandon Country Park (it’s council as opposed to FC, but only a few miles from High Lodge) where it’s substantially cheaper. Both have good cafes and toilets etc. so make good bases to wander from.