No one seems to have replied, so I'll offer my advice, such that it is.
Sounds like you just want a new complete rear wheel? So no need to buy a wheelset.
I'd just get a generic one from Halfords, my old bike, my £300 carrera did about 4k miles before I upgraded to a better bike, wheels and hubs were fine, still got them in my garage as spares.
So I'd just get something cheap and generic, and for peace of mind, if you need to, take it to your local independent bike shop to check the spoke tensions etc.