has existed for over 30 years as stated on their about us page. We used them for a project when I worked for on the Mary Rose exibition for heating and cooling the environment to ensure the boat didn't decay anymore and remained in a perfect state of restoration.
So I was pretty confident they knew what they were doing, having worked on a heritage site and on a Lottery funded project!
I don't know who told you that about electrical floor mats, but your information isn't correct. I am sure most people would feel happier about having a water based system with a pvc pipe running through a solid concrete floor or similar rather than an electrical device that is more than likely to go wrong. But by all means don't take my word, just google problems after installing underfloor heating electrical mats.
Anyway I just wanted to give Chris some helpful advice. Good luck with your project, which ever solution you choose.