When putting panels on a ceiling, i find the joists and screw some 2x1 roofing timbers to secure, and then make a kind of frame including round the sides of the ceiling with more 2x1, never had a problem yet!!!
If your looking to put spot lights in, remember that there has to be good loft space as the lights need at least 3 inches above the ceiling, which means if there is not easy access for the 3 inch space required, you will have to use 3 inch timbers and drop the ceiling.... or your sparky will go crackers !!!
If your looking to put spot lights in, remember that there has to be good loft space as the lights need at least 3 inches above the ceiling, which means if there is not easy access for the 3 inch space required, you will have to use 3 inch timbers and drop the ceiling.... or your sparky will go crackers !!!