8.33
As I understand the rules, ground stations had until the beginning of this year to upgrade their radios and so we should all be talking on 8.33 spaced "channels" by now (apart from the odd exceptions such as 121.5).
Looking at the available information, I noticed that one airport owner and operator, the Rigby Group, does not seem to have changed to 8.33 channels. Blackpool to Lee on Solent, their frequencies all seem to have stayed the same 25kHz ones (apart from one airport). If everyone should have changed by now, how can they carry on without 8.33 channels? According to CAA UK, everyone should have converted but none of their airports still using 25kHz frequencies seem to be in the list of "exeptions" published in the AIP Supplement 069/2018.
It is all very confusing.