You a correct in saying the mandatory handling has/is killing off GA at CWL.
They rip off circuits & low approaches cost approx £25 they refuse instrument training approaches 99% of the time, Filton becomes the next available airport.
I know for a fact the airport has refused a well established club from putting in a couple of a/c. Giving a very poor excuse, noise and security!!
Sorry no GA at Cardiff. Its just to busy