it is being driven fairly and squarely by the desire to attract and keep more biz jet, and possibly even further down the line, low cost, operators
Correct, with an equal emphasis on 'keeping'. They already have bizjet, and there already have been meetings where operators have expressed an interest in flying certain routes at certain time on certain days of the week in the near future.
Some operators may deem that the risk is too high for them to fly a couple of proposed routes, so will decide not to... So of course this radar installation is a business decision by the airport owners. They're not in it for an aviation safety award!!!
They know exactly what scheduled flights they want to afford protection to. The number of ATCOs that will have a radar ticket will be commensurate with that task initially. Should Oxford be succesful in attracting more business down the line, then they will beef up the service accordingly.
The plus side is that eventually there might be a real benefit to the general aviation community in terms of service available.
However it comes about, added safety in this part of the UK should be welcomed - it is an extremely busy area with quite a few 'incidents' weekly. The fact the 'incidents' happen in Class G i.e. 'see and avoid' means that what would be a very nasty airprox in controlled airspace is just 'what you can expect to get' in class G.