Thermal check
A sample certificate, not a live FENSA lodge.
The house's triple glazing is 0.8. The pack's sample lines are 1.4 for England and 1.2 for Scottish Section 6. Lodging this does not register a certificate, and it is not a FENSA number.
Sample house
Triple glazing, U-value 0.8.
Inside the sample England line.
Inside the sample Scottish line.