@Philippa85
I've looked at your lovely listing, & think the problem might be how you've set it up - listed it as ONE listing for up to 4.
If you wanted to list one room to one couple & the other room to another party, then you would need TWO listings, one for each room! (That's what I do with my 3 rooms.)
Tho' as @Mike-And-Jane0 say, our government is only allowing two households under one roof at present, is it not? - That's the law I apply to my own set up with a shared bathroom. BUT, your two rooms are both ensuite... So I guess that might put you in the same position as hotels & B&Bs which ARE allowed to let multiple rooms? (I didn't dive in here to moralise on that, just to say that listing your rooms separately would allow unrelated folk to book.- And you could still keep a listing as it is for when 3 or 4 people - or 2 - from one group need 2 rooms.)