Probably worth mentioning that the deadline for having PSVAR compliant vehicles on school services has been extended by another year to 31 July 2021 to take account of the fact that Covid has pretty much killed any chance of investment in fleets this year.
Personally I think a year is probably as far as they can realistically take it and therefore I don't see any further extension beyond this.

https://www.bbc.co.uk/news/extra/8rvpt6b...nation-act

An interesting read, where I learned a lot. 
Some fantastic photos and footage too.