Does anyone know what the maximum allowable rise, and minimum allowable
going on a domestic staircase is?

Max rise 220mm
Min going 220mm
Max pitch 42deg

So for rise of 220 at 42deg, going = 244mm
and for going of 220 at 42deg, rise = 198mm

Also there is a rule of 2R+G a broad limit which escapes me right now.

Toby.