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Thanks for your input.
I had a look earlier at Sheldon's but found the other way round of 7 speed cassettes on 9 speed bodies compatibility.
I'll have a look around and see what the best functional and financial options are.
Can get a 7 speed cassette like the one in the pic for a tenner and will need a new rear mech to have enough wrap.
Or get a 9 or 10 speed one (removing a cog), new rear mech, chain and shifter.
Casettes and rear mech work about the same.
Slightly more expensive because of the chain and shifter but nicer I guess as I have no indexed setup now.
Sheldon brown website have something on this.
Iirc: you can use 8,9,10 hg cassette on 7 by removing one of the cog. But all mech, chain and shifter have to use the same original speed for indexing.
8 speed cassette becomes a 7 speed but you still have to use 8 speed stuff for indexing to work.