So we'll agree to differ, like I say maybe we'll come back to this in a few months.
"Yes IT will be cov's problem, controlled airspace for the sake of it is no longer an option"
The CAS is not for the sake of it, it is for the protection of Coventry's flights, as any increase in controlled airspace anywhere is for the protection of that airport's IFR traffic. Coventry is no different, it is a commercial airport developing pax flights, if they justify it, they should be given the CAS protection. The fact that VFR traffic is forced down the LIC-DTY route is even more reason for CVT to get this protection, CVT do get several aircraft routing via the CT with no radio contact, are you saying that is a good idea with pax flights around? At the moment the traffic levels are such that the CVT controller can restrict releases and inbound routings to accomodate unknown transits but this will not be possible if CVT gets busy.
"looking at the totality of everything with Birmingham development likely including airspace for RWY2, and increased movement rates at NEMA the chances of BE growing to those levels is a pipedream-the potential problems in the DTY CTA around SAPCO for instance would be a big limiting factor"
So this is what it comes down to then, BHX and NEMA are getting busy so CVT can't...There WILL be ways that the airspace can be reorganised to assist TC and BHX. CVT having it's own CAS will help as it will mean that CVT traffic can dep on SID's that provide some lateral sep from BHX's. At the moment, BHX controllers try to get CVT's traffic into their airspace for protection, the consequence being that CVT's aircraft enter airspace designed for BHX's traffic - not ideal. CVT's own airspace would mean that this would no longer be necessary and the SID's could go out on tracks with some lateral sep, the use of step climbs could also assist with the CVT / BHX interaction. I'm sure BHX ATCO's would prefer that situation.
Look anywhere else, if the traffic justifies it, the airspace is reorganised to accomodate it as best as possible...the phrase fear of change springs to mind when reading your comments. TC controllers have coped well with plenty of change over the past few years with some significant sector reorganisation, IMHO they will not need to reinvent the wheel with the procedures for CVT/BHX and NEMA. CVT's CAS will significantly help such reorganisation