It's purely a temporary thing.
Depends on your definition of temporary of course
It's been like that with ATC and A/G Radio for 2 or 3 years now IIRC. The lack of RFFS started last year, conveniently, after the need for it to conduct PPL training was removed.
More to do with lack of staff, rather than them being on holiday.
Not sure if you can access historical NOTAMs, if you can, I guess you could check. Just had a quick look myself and you can go back to the beginning of January easily.