niknak:
The only way a long term plan would work is biting the bullet and contracting out to NATS
But I think it might be worth differentiating between:
1) contracting out to NATS = buying a radar feed from existing NATS radars which is then used by controllers at TK to provide a service, and
2) contracting out to NATS = employing NATS Services Ltd as your ATS provider, as is done at Heathrow/Gatwick/Bristol etc. This could extend to paying NATS to buy your radar for you (although I'm not sure I'd go that far.......)
Number 1 wouldn't allow you to do SRAs into Oxford because the radars are too far away. It might also mean you couldn't apply 3nm separations. Then again, given the traffic situation at Oxford, chances are you couldn't ever provide a Deconfliction Service anyway.
NS