Yes,removed old tiles,cut new holes for cctv,air,con,speakers etc,skipped old ones and replaced new ones.Bit fiddly as ther were plenty of cables above ceiling.You need someone to pass tiles to off ladder and to pass new ones up to save getting up and down.I replaced all the whole tiles first then all the cuts round the outside which were all the same so it was straight forward,just used stanley knife.Like i said wear goggles taking old one down as dust is a pain.When i said a day it was a 12 hour one though.I used one of the cheapest grade of plain white tile but they are superb and stand out brilliant with the mirrored chrome ceiling grid which was fitted 7 years ago.
