So is there a rebuild kit or a new complete pump i can buy in the uk
No kit I've heard of, but there should be a parts list on here somewhere. I'm sure Sean could put together what's needed. New pumps from Yamaha I'd imagine, but expensive and no need really, unless the housing was damaged.
I doubt you'll need the gear but check it over carefully and replace #4 and #5 if necessary. I don't replace #13 for the drain bolt gasket and only muck with the thermostat if the housing is leaking. I've never seen anything thermostat related go bad.