Can't see that working unless the scrappage scheme takes into account the value of the ICE car. if you have a 30k ICE car and want to move to EV there is no way the government are going to pay the going rate of the ICE car as scrappage. The only way a scrappage scheme works is if what you are scrapping is a valueless heap of crap surely? Even then if someone is driving around in a £500 to £2000 car are they likely to be able to afford a 25k plus car even if they get 2k for the scrappage?
Or have I missed something completely?
Previous scrappage schemes (ICE to ICE) have worked when it comes to taking older, dirtier cars off the road.
An ICE to EV scheme would probably need to work a little differently (that would be for experts in the field to figure out), but I wouldn't envision it being too different. You're building it specifically to get the *dirtiest* vehicles off the road and replaced with clean(er) EVs. So you wouldn't be targeting ICE's that still have significant second-hand market value.
Also - there's a good reason why I suggested it should be coupled with initiatives designed to encourage driving down the price of entry level EVs.