I believe only full EV contribute towards government net Zero figures and as such will be the only vehicles to qualify for the perks. Even plug ins have less than 10 years before they are banned. New Pure petrol and diesel Inc mild hybrids only have 53 months left, so expect them to be getting phased out in about 3 years time as these can’t be sold from 1 Jan 2030, unless goalposts are moved.
I wouldn’t put money on any of those dates yet, as the UK will follow the EU on this one, as we have done so in the past for obvious reasons, It was a Labour tatic to lower the date back to 2030 and I expect, as we get closer this government or the next will change the date back inline with the EU. As for Plug in Hybrids an EU strategy paper has not ruled out the sale of plug in hybrids after 2035.
Overall, there’s along way to go yet, anything can change, as long as engines can follow euro class emissions who knows what the future holds. , Euro 7 Standards will take the lowest limits from Euro 6, and apply them to all new cars, regardless of what fuel they run on. The other influncing factor is how the european market looks at EV’s at that time, which up to yet has been slow.