OK guys what's the trick?
Slap them up they slide down the wall - have to keep jiggling them till the adehsive starts to go off. 2nd sheet I did I taped the top row to the wall but it still had to jiggle them as the net backing seemed to stretch - if not disintegrate - when wetted with tile adhesive. Took bloody ages and still didn't look too good.
If I have to do more I'd be inclined to gripfill 'em on :-)