My other halfs commuter needs a new wheel due to a cracked rim, but it uses an old style of cassette/freehub I've not before, and I'm not sure how to source a new wheel that will fit the cassette? The bike is an old carrea with a 7 speed shimano tourney cassette. I can't buy a new wheel with a modern cassette as it'll require the whole drivechain replacing.
It's in the pictures in the thread below, but I'm not sure what the standards called or where I can even buy a new wheel,I couldn't see anything that matches on halfords or evans websites. Any advice would be really great as I'm getting stuck here.
That's a freewheel. You need to get a wheel for a screw on freewheel which you should be able to get for £20 or so. You could alternatively fit a cassette wheel and buy a 7 spd cassette (and an 8 to 7 speed spacer as you'll unlikely find a wheel with a 7 speed freehub)
As someone has already answered on your linked thread, this is a 7 speed freewheel, not cassette and any half-decent bike shop should be able to get you a new wheel, or buy this (it's low rent) https://www.sjscycles.co.uk/wheelswheels-rear/700c-622-rear-36h-unbranded-road-wheel-with-screw-on-freewheel-black/
Personally i'd get a 8 speed wheel and a new 7 speed cassette + spacer
https://www.amazon.co.uk/Cassette-Spacer-using-Cassettes-Freewheels/dp/B00GJMSLTK
https://www.chainreactioncycles.com/shimano-cs-hg41-7-speed-cassette/rp-prod178988?
If budget is tight then you can still buy 7 speed wheels like this one:
Actually Baldwins on ebay have all sorts of wheels that would work for you, I'd get in touch with them.
http://www.ebaystores.co.uk/baldwinscycles