There are occasions where the option of having CTAF in the UK could be useful. I think it was last year when Durham Tees had a controller shortage and NOTAMed the airfield closed several times each day. The CAS of course lapses when the airfield is closed and no one can land. Any inbound planes would have to take up the hold in class "G" and wait (unless they could sit in the bottom level of P18). If there had been the option to down grade to CTAF the planes that arrived while the controller was on his break could have continued to land.
bb