Sounds possibly like Scottish trying to stream inbounds with speed control instead of letting them run toward the holds. This then leaves Radar having to vector to either close up or create gaps for the arrival sequence. The airspace around the Scottish TMA doesnt leave much room for manouvre within the vectoring areas of either EDI or GLA when there are lots of aircraft in and outbound.
Scottish also work to 5 and 10 mile radar seps where as approach radar units can work down to 3 miles which is why Radar can tighten you up in the sequence if required.
Invariably EDI and GLA Radar have to work with what they get given from Scottish, and this may mean that there is little to no room for resequencing depending on the inbound flow from other sectors.
Anyone from Atlantic House care to comment?
I think that a visit to both units would be beneficial for you to see what is trying to be achieved, and for the controllers to take on board what is preferrable for you.
PS: Don't forget the flip side too! Approach also have to create gaps in the inbound sequence for departures to get away...no luxury Parallel Runway ops up North!!!!