I am intending to replace the 'vinolay' floor covering with B & Q click-fit plastic system. The 'vinolay' is laid over the original vinyl floor tiles from 1965, which are stuck to concrete floor with bitumen adhesive. They seem sound, and I believe are difficult to remove. However, in one location next to a wall 9 vinyl tiles were loose and damaged, due to a heating pipe leak in concrete floor, which has been sorted. As these 9 inch square tiles are no longer available, I was thinking of using 3mm thick sheet vinyl flooring, cut to size and with suitable adhesive to the concrete, to bring all to same level, then lay the new floor. I have not laid such a floor previously, and any advice would be appreciated, thank you.