Big fines for employers that force staff work in offices when their jobs could be done at home, but they don't trust them / think they are slightly less productive etc. Extra fines if office found to be non-covid secure as well. Fine would be minimum £10k, possibly increasing with number of staff in office or a proportion of business turnover/profits, whichever way the fine is greater, so multi-million companies don't just think its a petty cash and ignore it. System backed up by a widely published helplines and websites so people can report anonymously.
Assuming we get down to infection/hospitalisation levels lower than Sept 2020, then schools reopen on a red/blue system, so classes / year groups etc split into 2 or 3 (in which case red, yellow, blue i guess 
) so there are less children in a school at once and therefore social distancing is more feasible. Children would get some in person education and socialisation with their peers and hopefully teachers would feel and be safer. Children and staff would be less likely to catch/spread covid in the school and at home. Also let teachers wear masks if they want.
Would quarantine all non-essential travellers in hotels. Essential travellers would still be required to test negative before departure, on arrival plus retesting at 5, 10 and 14 days in UK and self isolate for 14 days (assuming they are in UK that long) but could quarantine at home or work instead of a hotel, but massive fines for breaking quarantine and forced hotel quarantine on all future trips even if for work. If you couldn't prove with evidence that your travel was essential, then have to quarantine in a hotel. Until community transmission was very low even with schools open at normal capacity, businesses open etc and majority of vaccinatable population receiving all doses of vaccine(s).