One of the big problems is that there is a lot of CAS around Glasgow/Edinburgh that is no longer used/ needed and should have been released to class "G" a long time ago. Since the removal of the cross runway the airspace associated with that has been wasted for years and caused controllers work load to increase by controlling something the really didn't need to.
Also, the rules of class "D" are quite clear IFR is separated from IFR and traffic information is given on VFR with heading to avid given on request, i suspect these rules are not being complied with.
Lets have a NOTAM temporarily and immediately releasing blocks of unused airspace to allow recreational fliers to go about their business in safety.
bb