I havent been to Bintel for a while now, and I took my son to the footy on sat, so it must have been my evil twin

Ken, I managed to set up the ST80 on top of my ED80 as you did on the photo. But the long dovetail bar that came with the ST80 prevents the ED80 focuser from being in the right place, unless I take the ED80s guidescope "foot" off.
Anyway, will see what I can do with the ADM adapters once they arrive in the post.
Cheers, Bo