lees van hool previously registered ALL173Y is now registered H912EFT and is in Lees generic white livery. this will be why no new reg exists for the coach. Had a makeover when repainted and looks very smart.
Guessing some of the private registrations a re now with the lees family on a private basis because the older coaches haven't regained private registrations when repainted. This may be to do with the businessman who brought into Lees and Durham city coaches. Both families seem to run the respective businesses still though so think he is a big shareholder in both companies.