England and Wales: 1950-1966
none of the above
System built, as built, no insulation (assumed)
Solid, no insulation (assumed)
Low energy lighting in 80% of fixed outlets
Pitched, 75 mm loft insulation
Boiler and radiators, mains gas
From main system, no cylinder thermostat
mains gas (not community)
Room heaters, electric
Fully double glazed
double glazing installed before 2002
Programmer and room thermostat
none of the above
System built, with external insulation
Solid, no insulation (assumed)
Low energy lighting in all fixed outlets
Pitched, 75 mm loft insulation
Boiler and radiators, mains gas
From main system
mains gas (not community)
Mostly double glazing
double glazing, unknown install date
Programmer, room thermostat and TRVs