Sorry to come back on this, everything is still working but I am uncomfortable with the fitting of the chandelier in the study - which is the room that had the loose connections.
It's a brass coloured chandelier, 3 x candle bulbs, brass coloured chain with lights at one end and a bell flange at the other that fits to the ceiling over the plastic rose with its cover on.
Re-fitting it yesterday was driving me round the bend so I left it and went back to it this morning. The holes on the flange do not line up with the ceiling rose. What has been done is the ceiling rose cover has holes drilled for the fixing screws inboard a bit of the flange holes and the rose holes are inward a bit of that. The outcome is putting a screw though means it is angled inwards as it goes from the flange with wider spaced holes than the rose. The rose cover has to be put on as otherwise the metal of the chandelier would touch the ceiling rose connectors.
Seems to me this is not a good way of fitting this. I could just put a new rose up and run a normal light from it or try and make a proper job with the chandelier - I have it, and it's in keeping with the house.
Is a sensible approach to use a choc-box connector to replace the ceiling rose, then add a wooden ceiling rose with a diameter bigger than the flange on the chandelier and a circular hole cut out in the middle to take the choc-block. The wooden rose can be fitted to the ceiling with holes that don't clash with the chandelier then the chandelier can be screwed to the wooden rose.
An alternative would be still use a choc-block and cut the plasterboard so it can pushed in the cavity then fit the chandelier directly to the ceiling.
Any thoughts as to best/safest approach?
Many thanks.