Can't believe I missed that! Well done me old mukka! One huge amount of knowledge is tucked away in that mind of yours. Thank you.
And the ones that have benefited the most are the ones that don't read your posts! : the paying customer and their bathroom!
So on behalf of them and lots of tile & tile adhesive manufacturers (as you've saved them a few complaints / gesture of good will bathroom and kitchen re-installations too I bet) I thank you.