Thank you all for your replies. Really appreciate. Most importantly you convinced my husband. Tiler will be back tomorrow at 9am and I have to sack him. Will pay for materials used and 2 hours labour that was the time all this mess was done. Going to buy another kit and redo. Already have insulation boards but tiler insisted they were sold to us to meet the sales and didnt bother to put down. Thank you all again. This is really helpful place no doubt will use it again