your right Andy, my problem is it was clearly stated on the front of the bag and now its not. My first point of reference is the info on the bag.
if I go into a shop to buy some floor tile adhesive for, say, porcelain on wet ufh and BAL, Ultra, Ardex and Mapei all clearly state 'suitable for porcelain and ufh' on the bag I will pick one of those. I will not search the web for the spec sheets to find out what each one does, hence I will not use Weber set plus eco.