I have been asked why the proposed airspace surrounding Cardiff and Bristol is so complex, well DAP insists you request only the minimum that you can safely accommodate your movements within.
When putting the proposal together there was no question of putting in a request for more airspace on the basis they would ask you to reduce the size, we had from the start to put in a realistic proposal.
DAP quite rightly insists that all airspace users are considered hence why we have what on the face of it looks a very complicated piece of Class D airspace coming in, the minimum class D required for a safe operation.
Locally there have been very few problems as they know Class D transits are not a problem but equally there is still a considerable amount of Class G. It is to some seen also as a benefit as they know when it comes in that ATC will not have the same requirement to wish to talk to aircraft flying out in Class G.
Carefully planned airspace should have a minimum impact on most GA users, equally if you are Class D and there is difficulty due workload issues or density of traffic to accommodate VFR perhaps the airspace should be of higher category.