Hahaha.
It is probably like the anti-condensation paints that contain grains of e.g. polystyrene or cork.
It will provide a tiny bit of insulation.
However remember that most lofts have between 150mm and 250mm or insulation, and cavity walls have 50mm to 70 mm of insulation.
Insulation and heat saved varies with the thickness of insulation.
Unless you are going to apply paint 150mm thick you will not get the saving you would get from insulating your loft. 25% is obviously a lie.
However, if you like the look of this product, or are thinking of investing in the company, I also have some magic beans I can sell you and a goose that lays golden eggs.
I am interested to see they have an 0870 phone number, which costs you extra for the privilege of speaking to them. The extra charges are shared by the phone company and the paint company. I could not find "Thermilate" in the BT phone directory, even in Bradford or Huddersfield. The website avoids giving an address. Some of their "International Distributers" have email addresses at hotmail, AOL, yahoo and bigpond, so it is obviously not a serious business.
by the way, harshy, I see that the website designed is claimed by a person named Harshad Patel. Coincidence, huh?