Guitar. Anyone can learn basic chords. If you can curl your fingers into a fist, you've got enough finger flexibility, and if you can tap a table in time with the music then you've got enough rhythm to strum along. If you don't know the chords, play softly until you've worked them out.

It'll probably take 3-6 months of homework to get to a level where you can strum along. And a cheap second-hand nylon-string will only set you back about £50 - more than a whistle, but a damn sight less than a squeezebox.

Graham.