The wire is now successfully installed under a new tile floor awaiting initial test. Fitting instructions were well written and
easy to follow and I would certainly use this product again.
My only complaint is with the multimeter which was supplied with a dying battery, but then even on replacing the battery it would not yield a correct resistance reading. Fortunately I own a professional grade instrument.
We're now looking at a well-specified solar installation to minimize running costs in the winter. :-)