Should have said low carbon rather than renewables as agreed they can't power the entire country.
At least with EV/ASHPs, you have the option to run them on renewables, which you don't with a gas boiler. Yes, 60% might have been from gas (take your word for it) this weekend, but last April 92% of all energy was from renewables. If the 60%/8% was nuclear, hydro or other 24/7 low emission generators it wouldn't be a problem at all.