Actually you can get aggregate data for all homes built ever - since 2016, in 2022 census, and electric heating represents a dwindling proportion - about 50% of all 93k homes built in this period have electric forms of heating (most likely heatpumps).
Type of Heating Value
No central heating 943
Oil 8,702
Natural Gas 29,506
Electricity 44,611
Coal (incl. anthracite) 349
Peat (incl. turf) 557
Liquid Petroleum Gas (LPG) 369
Wood (incl. wood pellets) 527
Other fuels 6,537
Not stated 1,027
All households 93,128
This survey suggests there's around 61k heat pumps in use in residential as of mid 2022 again from census,
That's nearly 18 month old data so guessing figure even higher now