Dear Superfizz
I am practising hand therapy in the UAE. We tend to use a company by the name of Homecraft Ability One (UK) and NorthCoast Medical (US). Smith and Nephew used to supply us but no longer (not sure in UK now).
My suggestion is to go shopping especially in a toy shop and hardware shop. Things like coloured cones, music toys, basketball for kids etc are great to play with, I mean treat patients with for functional hand activities. Hardware shop can supply things like nuts and bolts for fine motor activities. Pretty much just go shopping and anything that strikes you as being good for treatment then get. But be aware of expense.
Good luck