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.
The "old" frequencies are still spaced by 8.33 kHz!
Seems to me that this is an exercise in wasting millions of everyone's money for no good reason. Most of the frequencies that have changed remain almost as per the original ones, but with 0.005 added on. Unless there was interference on the original frequency, what is the point of changing them? Have these frequencies been changed just for the sake of "justifying" unnecessary legislation?