Logical
Suggest you pop in to ATC for a chat. Perhaps you could outline your requirements and come to a better understanding as regards the general traffic handling and co-ordination problems. I'm not at Coventry but nearly all Controllers are more than happy to see the "customer". Perhaps the luxury of refined constant descent low drag approaches that are available within Controlled Airspace are not so easy to achieve in that area.....but that would only be a guess on my part ; furthermore it could be the inter-twining complexity of a multiplicity of climbing/crossing/descending tracks in the area. Good Luck with the new outfit, down here at Swanwick we've seen a few of your planes plopping along on our ATC wonder-scopes.