The CAA Proposal is to permit IAP's at Aerodromes with only Tower controllers or AFISO's is here: -
http://www.caa.co.uk/docs/43/diap_ri...article_90.pdf
The 'robust' safety case will be interesting...Just how do you 'manage' the traffic in the FIR, with no mandate to issue positive instructins/clearances.
A couple of other points to bear in mind, you'd need an initial and annual Obstacle Survey (Initial about £12K, annual circa £5K), appropriate safeguarding to ensure that the local council don't put up a tower block on a 3 mile final (we've just been quoted £4k pa)....and you'll have to design your own procedure as DAP will no longer do it for you.