from memory-the plan document is at work-class D zone and class D stubs to protect the instument approaches to 05/23, butting up to Birminghams airspace, including SIDS and NPR's
personally dont think this will happen any time soon-not sure that Cov have enough traffic to warrant it especially when the effect it will have on transits in the area is taken into consideration- the airspace lies right across a major north south track, almost abutting NEMA airspace to the East, leaving little room for any one who does not want to cross CAS, especialy at a sector safe level! the list of potential 'anti's' is long, BGA, PFA, AOPA, any local politician that thinks his 'patch' will now be overflown, other airports in the vicinity-Cov did protest about NEMA's airspace application!
the airspace sharing that would be required to keep say Husbands Bosworth happy might negate to a great extent the benefits any airspace gave the Cov ATCO's