I've not read the full thing and, as a Scottish teacher and parent, this doesn't impact me but hey ho.
First I'd like to point out that many People reminiscing about their longer day, or comparing state to private, forget to mention the changes to breaks and inclusion of extra curriculars. In (Scottish) state schools we are 9-3 for most primaries, although some finish at lunch on Friday but work until 3.30 for the other four days. Children typically have one hour of breaks (15 minutes in the morning and 45 for lunch) with 5 hours of lessons. In the private schools they seem to have longer breaks and their extended times are given to extra curricular activities, not more maths and literacy. In days gone by there were additional breaks. It's not the same.
Secondly I'd like to say that I'd only agree if these extra hours were completed by specialist teachers. I have no music, art or p.e. qualifications and children deserve to have the best, if that's what the time is used for. I also wouldn't want to attempt more maths or literacy at the end of the day, there is a reason we do these subjects in the morning.
Lastly I'd like to point out that I, along with most of my colleagues, wouldn't be able to do our job if they just stuck extra time on.
At the moment there are very few teachers that can complete there 35 hour a week expectation. It literally gives us 7.5 hours for marking and prep per week where I'd probably spend, at least, that time on marking alone meaning all the prep (daily plan, weekly plan, topic plans, making ppts, differentiating work, reading 3 different novels etc) comes above the 7.5 hours. If I were expected to work for another hour a day I wouldn't be able to complete my marking in school (due to our shutting time) and it knocks on to everything else. I know that conditions in England are much worse and the job would become more or less unmanageable. Unless the expectations were changed, our core terms to our working week etc and a better salary paid accordingly I could see teachers leaving faster than before.
I do agree that this is a way of the government absolving themselves of responsibility for the attainment of children post COVID.