Is it elegal for my 8yr old daughter and 2yr old son to share a bedroom in a 2 bedroomed council house?

ANY question on law needs to include your general locale as laws vary by area.

I assume, you are in the UK by your use of the term council house.

From what I understand, Local councils establish a set of rules and this may very well be covered by them.

From a non legal standpoint, I don't see a problem given the ages. But you really need to check with the local council.

Age limitaion on different sex children sharing a bedroom uk

This isn't covered by law, although there are recommendations.

We merged your two threads. Did you not see my response to your previous post? Did you talk to the council?