I wish it WAS controlled airspace, for similar reasons to Heathrow Director. I've had a couple of worrying occurrences in that area over the years.
Oxford have the busy airspace but no radar, Brize have the radar but not the airspace.....
Pilots who declare a VFR departure from Oxford but go IMC in the climb towards transit traffic when still on Oxford's approach frequency don't help.
It can be difficult to know who best to speak to at times.