We Sell Any Floor Limited

I have a kitchen floor which is just over half suspended and half concrete, over which a layer of 12mm marine ply was put in order to prepare the room for a tiled floor. The ply was screwed to the existing floorboards and it looks like an attempt was made to stick it to the concrete using some sort of adhesive. As the tiling would not be required under the units, the kitchen was subsequently fitted with cabinet feet at max extension and it's only since then that it's become clear that the ply over the concrete is not at all fixed to the concrete and has to be pulled up. Not that it helps a lot, but the concrete end has far fewer fitted units on it.

I feel that the ply needs to simply come up from the concrete and that tiles should be laid directly onto it, and I now wonder if we should have removed the floor boards, added extra battens/noggins and put marine ply in their place in order to have a level wood and concrete base for the tiles. This would have had an added advantage of the floor height only going up by the thickness of the tiles (plus any matting or whatever) rather than by the tiles plus the ply.

With the mixed flooring I've also read about the need for something where they meet to avoid cracked grouting and/or tiles caused by movement.

Any advice gratefully received.

I was just wondering if anyone could tell me the best glue to use to put down a solid wood floor onto a concrete subfloor?? Or what other ways could i put it down?

many thanks