https://www.ebay.co.uk/itm/60-150CM-Tile-Mirror-Roll-Wall-Stickers-Square-Self-Adhesive-Bathroom-Decor-UK/254011223238?hash=item3b243facc6:g:M9AAAOSwUu5cBL-8 This stuff will give a half decent result Colin, a mate used it on a heated electric mirror glass that was over £200 to replace. Cut to size.
Tony.