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

So for rise of 220 at 42deg, going = 244mm (2R+G 684mm)
and for going of 220 at 42deg, rise = 198mm (2R+G 616mm)

Also there is a rule of 2R+G a broad limit which escapes me right now.
Greater than 550, less than 700

In addition:
Tapered treads i.e. winders, should have a minimum going of 50mm
Going for a stair of up to 1m width should be measured at the centre line
All consecutive tapered treads should have the same taper
All steps in a flight should have the same R & G
Not more than 36 steps in a flight
Open risers should not permit the passage of a 100mm sphere
2m recommended headroom above the whole of the stair

There special clauses regarding stairs to a loft conversion (1 room plus
adjoining bath) which give greater flexibility.

All in approved document K

Toby.