Went to a car boot sale and a book and "antique" shop that a friend pointed me at - he'd seen a few cameras there.
Ended up with
Kodak 620A folding camera (6x9 on 620 film)
Agifold folding rangefinder (6x6 on 120 film, incorporates a nice working rangefinder and an extinction meter)
A Zenit E and a Zenit 11, both working well and with Helios 44-2 lenses, one very good and the other with a dented filter ring
A Praktica TL1000, working but the silvering of the prism is defective, with a very good Pentacon 50mm/1.8
and a Canon Eos 300 35mm body with a good working 28-90mm AF lens
Total cost was £80 (and a negligible amount for some lens and body caps and cable releases I've added), hopefully I'll double that if I can bring myself to part with the folding cameras.