Wouldn't be surprised if the TC relocation brings EGHI into the fold. They and farnboring are currently the only sarf of england NATS airports to run their own approach
Sorry Vlad, but apart from your spelling, your information is also totally incorrect.
The NATS units at Birmingham and Manchester both have approach radar on site. If by "England" you really do mean "England" then that's it as far as current NATS units are concerned although of course in Wales, Cardiff is a stand-alone radar unit, in Northern Ireland, so is Belfast Intl., and in Scotland, so are Aberdeen, Edinburgh and Glasgow.
As for Southampton moving to Swanwick, well it might seem logical but first consider why BAA would agree to pay for Band 5 ATCO 2s providing the approach radar from Swanwick when all they're currently paying for are Band 1 ATCO 3s at Southampton...
So no cost benefit - and difficult to see any tangible operational benefit (a primary and secondary radar feed from the NAS computer into Southampton would adequately serve Southampton and Bournemouth, and would also provide conflict alert for the guys operating Solent).