Thanks Dave, I think the withholding of money was down to the policy stating "...water escape from pipes" which this certainly was not. More like water ingress to walls, but my point is the insurance companies are totally out of touch with damage prevention as are the general public, as I was.
The first tiler, who came highly recommended, obviously chose not to tank or was oblivious to tanking altogether.
i think you stated the tiling was done via a builder,if thats the case the tiler tiled as he was asked,thats the problem who is it going to be down to,if its a privete job and the tiler asks whether you want it tanked or not, you say no which at present would be 99% of punters,what do you do as a tiler lose the job or do the job.
if its for a builder my opinion is its down to the builder to either tank or pay you to tank it.
take this situation builder builds extension,you tank and tile the new ensuite shower 6 months later the tray has dropped 7mm and the client has a leak in his kitchen and all of a sudden its the tilers problem,whereas its the plumbers problem or the timber frame has shrunk etc etc.
i for one will not give a guarantee for tanking as very rarely is it something the tiler has not done right its a problem with the shower tray moving or not being sealed properly.
i agree something should be done regarding tanking or jointing issues but 999 times out a 100 the problem is the tray so therefore its not for tilers to be sorting it out or taking the responsibility.
if it becomes a tile fixers remit to tank a shower i for one would say no thanks,as the damage could be very expensive and to prove i had done the correct work would be a legal headache and very expensive to another insurance company ie mine,why should i be covered to pay for other tradesmens mistakes.