They'd get a lot more people onto heat pumps if they didn't block grants on any unit that can cool as well as heat.
Even then, I think I'd still want gas to heat my hot water. The electrical system can't cope with doing that on demand. I used to have a hot water tank, and I'm not going back to that. Combi boilers are so much more convenient.
Heating systems can afford to be slow though.
I'm pretty sure I saved more than this 30% (which given it's in a headline, is going to be an absolute best case scenario) by going to Agile Octopus.