I have some tiling questions ?
I'm going to lay ceramic/porcelain floor tiles in my small downstairs
cloakroom.
The house was built in the 80's, and the existing floor covering is hard
(brittle) vinyl tiles, with a hard black bitumen like adhesive onto a
concrete floor.
Can I lay the tiles onto the existing vinyl tiles or will I need to strip
the vinyl tiles and adhesive back to the concrete ? If I do this will I need
to prepare the concrete in any way before laying the new tiles ?

Thanks for any help
Tony