And I thought this was the proper place to get advice!!!!!!!
Just as well I know you all.
Anyway, they are clear cellophane tacky front fixed sheets, but the adhesive will 'taint' the final visual look of the tile - so I'am after the whitest, the colour of the grout will be my next thread!
Today I skimmed the walls over with a white (ish) adhesive so no background colour would bleed through, and with all this invaluable information I am now in a better position to make my final choice.
If I use 'white tack' would I have to put a piece on each sheet or each tile (11,250) and as each tile is 20x20mm what size blob (if that is the technical description) would you suggest.
Thanks for all your 'help' and if it's successful I'll try and post some pictures.