Why a choke point? It's just Class D.
Although why airfields like Southend, Norwich and Doncaster have it or want it is quite frankly beyond me. I was at Gloucester last weekend talking to one of the wheels and they have up to 500 movements a day. They seem to manage quite well. As do Humberside who I think I'm correct in saying have far more movements than Doncaster just down the road. Although who knows, Gloucester Class D incoming? Maybe we should just make the whole of the country Class D and have done with it.