"Sounds like a dangerous bodge.

This type of ceiling rose is designed to accept:-
TW&E feed
TW&E loop to next fitting
TW&E switch pair
Twin flex to pendant.


All contained within a fire resistant enclosure.


If you don't want to use this method - say because of a non 'standard'
light fitting - you use proper junction box in the ceiling void.


Anything just insulated with tape and left dangling just won't do."

Thanks for the advice - I had my doubts which is why I asked. I have
read that using connectors and pushing these up into the ceiling void
was a common practice. From what you've said, I guess that this is
still unacceptable, unless you use a junction box?

I've left the rose connections exactly as fitted by the electrician, so
I assume there's no problem with these - but in taking the connector
strip out of the plastic case of the rose, I guess that's the problem?
The round plastic case is too big to fit into the recess of the new
light fitting, so that's why I can't use it.