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Although the air tightness figure of 1.08 ACH narrowly missed the target of 1 ACH required for certification, the performance of the house is definitely in line with the EnerPHit standard.
The house provides comfort and excellent air quality in hot and cold weather. Gas use for the last year was a tiny 4800 kWh (heating plus hot water) and electricity bought in from the grid came to 1500 kWh.
In other words, gas costs around £200 per year (plus a standing charge), and electiricity costs almost exactly the same. Altogether, this means that we earn more for the electricity generated by PV panels on the roof than we pay for gas and electricity.
The secret is the Passive House methodology - insulation, air tightness and a whole house ventilation system with heat recovery. The thermal mass prevents overheating in summer and keeps indoor temperatures steady all year round.