If you have access to the space above the ceiling such as a loft you can put a piece of wood over the hole held to the plasterboard with a couple of screws. You can then fill the hole with filler or plaster and screw the lighting rose to the wood. If there is no access the technique is similar but more tricky. Find a bit of wood such as 2" x 1" by about 6" long and screw a long screw partly into it near one end. This screw is for use as a handle for getting the wood in place. Feed the long end of the wood through the hole then the short end then slide it along so the screw is up against the edge of the hole. You can now put a couple of screws through the plasterboard into the wood to hold it in place then remove the long screw and do your filling etc.
Fidom thanks for the reply. I want to attempt the wood from above method but won't there be two screw ends poking through the ceiling being visible in the bathroom?
So how do you screw into a piece of wood which is just sitting resting on the plasterboard above? Won't it move all over the place whilst trying to screw through the plasterboard?
If there are 2 people one can hold the wood from above whilst the other puts screws in from below. If working alone you could either weigh down the wood with something until the screws are in or you could screw screws in from above through the wood into the plasterboard then put more screws in from below. If the ones from above poke through you can now remove them. If you do put screws through the wood from above it would be best to pre-drill the wood for them.
Cut a piece of say 18mm x whatever which will go through that hole (3" x 1" planed), short enough so that it can be fed in through the hole.
Screw a 3 or 4 inch screw into the piece of wood so that you can use the screw to manoeuver the wood.
Once in place and with the wood laid flat on the plasterboard, you can hold onto the manoeuver screw whilst you pop some screws through the plasterboard and into your wood.
Cut a piece of say 18mm x whatever which will go through that hole (3" x 1" planed), short enough so that it can be fed in through the hole.
Screw a 3 or 4 inch screw into the piece of wood so that you can use the screw to manoeuver the wood.
Once in place and with the wood laid flat on the plasterboard, you can hold onto the manoeuver screw whilst you pop some screws through the plasterboard and into your wood.
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