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My house was built in 1988 - is it safe to assume that it has cavity wall insulation installed at the time of construction?

In the last year I have replaced the Central Heating Pump, Thermocouple and Electrode. Everything has been hunky dorey until I got home yesterday. The house was warm and I turned up the thermostat to make it more comfortable. An hour later I noticed that the radiators were cold. I looked...