I appreciate your offer and thanks but these people have only asked me to advise what I would have charge IF I was to do it which i don't have time to do.
They apparently have all the materials which they had already bought and told me they were shocked that the
tiler they had in wanted £1500 to do the job. I thought the price was fair. Now I am totally confused having seen your estimate. Thanks very much though for such a detailed professional reply.
Kev