can offer you a wide variety of services such as:
FULL REFURBISHMENT & RENOVATIONS
PLUMBING, HEATING & GAS
ELECTRICAL & DATA
GUTTERING & DRAINAGE
CARPENTRY & JOINERY
PATIOS & GARDEN
You can tile over tiles, with the right preparation, but i would never do this, the proper way is to strip right back to original wall finish.
dont worry if you do pull a bit of plaster when stripping the tiles, as its easy enough to replace.
tiling over tiles can make it awkward, ie extra thickness when tiling around shower fittings.
for the sake of a few hours work i would take them of.
I think it's best to replace the ceiling plasterbord
I could not give a price without seeing the work and take measurements
replace is the best