There is a number which sums up Scotland’s heating headache. It was published this summer - amid all the usual fanfare about the country’s genuine progress on renewable electricity. The figure was a measure of what proportion of Scottish heat comes from oil and gas. It was 93.3%.
Scotland has one of Europe’s best records on clean power. And one of its worst on clean heat. With ambitious targets to get to net zero carbon by 2045 for Scotland and 2050 for the UK, householders and housebuilders, tenants and landlords, have got remarkably little time to wean themselves off now traditional gas boilers.