Not in England, but for those asking how you socially distance secondary school students.
This is how my youngest brother's school has dealt with it:
Individual desks for everyone.
Groups not big enough to fit in their normal classrooms with 1.5m distancing, have been moved to the library, sports hall, lunch hall, lab and corridors. Children have been occasionally taught outside when the science lab had to be used for whatever reason.
A few classes have been split into two groups and they're using the smaller rooms, where reduced numbers allow for social distancing. They struggled for a bit here with staffing.
Staggered break times.
Staggered lunch times.
Each class comes in at a designated time. If you don't make it by 8.40 if that's your set time, you go back home. They will not allow free roaming around the school (exceptions are made for medical appointments etc).
The library only operates 5.30-6.30pm instead of 8.30-6.30 like it used to be (school finishes at 5pm).
Only one space designated for PE. Students been taken to local open spaces if two groups clash, they exercise in parks, on the playground or come up with creative ideas on how to do PE in the classroom. Not ideal, but nor is the pandemic.
It's a big 3-18 school and they have been open ever since September with no major disruptions or outbreaks. Schools in this country never closed despite the 2nd and 3rd wave and a huge number of cases (1,400 incidence a couple of weeks ago). In 6 months they've only sent home one class of 30, once. Everything else has been normal, and no transmission has happened inside of school. A few close contacts have had to isolate but we're not talking large numbers here. It also helps that masks are compulsory from the age of 6 so the kids have been socially distanced AND masked.
It's doable. It requires a tonne of organisation, planning and resources. The education department spent the whole summer planning for this, and it's paid off.