IO540: there used to be two dedicated 'Channel Crossing' services, one from Lydd and the other from Kent Radar (at Manston), this latter being provided by a NATS controller working alongside the RAF Manston Approach controllers.
I'm sure if finance was forthcoming, the present ATS provider at Manston could do the same again (staff availability and radar serviceability permitting)
Also, provision of LARS isn't restricted to weekday only RAF units; what about Cardiff, Farnborough and Southend although admittedly their hands are tied somewhat due to a lack of SSR.