The flimsy chromium-plated plastic bush that is screwed into the side of
the loo cistern holding the loo handle in place has cracked beyond
repair (what a shoddy piece of "engineering" it is too). I have no idea
of the make of the loo -- the manufacturers were not proud enough to put
their name on it. It's about 10 years old.

Is it normally possible in such situations to get a replacement handle
assembly from one of the sheds, or from anywhere else, or do I need a
complete new bathroom suite?

--
Ian