If people fail to see why that OFCOM reference covers it I can only think that it was a very long time since they did aviation law. It clearly states that the frequency band is authorised for AGA voice traffic and ACARS under defined parameters. Clearly any other use is not authorised, and blipping the carrier five times to switch a lighting system is nmanifestly neither voice comms or ACARS. What is hard to understand about that?
So Police use it - they've got an exemption and we haven't, though I'd be surprised if there were any discrete frequencies spare in our crowded aircraft VHF band. Do they use air band, or a seperate transmitter on another band? If its airband there'll be nothig very "secure" about it - does that mean "secret"?
And I think it is also clear that the CAA have no wish for this to become commonplace for whatever reason so there is no incentive for them to relax their stance. It just ain't going to happen here.