There’s a bit of confusion about this. It USED to be the case that a C1 driver could gain cpc hours from CAT C licence acquisition training but this is no longer the case. Doubtless there will be some trainers who either don’t know this ruling or who ignore it. But I play to the book.
Hope this helps, and sorry for the delay in responding. Been in a meeting with DVSA today so not been near a computer.
Pete 