I think it's is necessary to have some form of punishment for those who do not abide by the rules, otherwise people are just going to ignore it. Here in Australia the fines for breaching isolation or quarantine vary from state to state, here in Queensland it's generally up to $13,000 dollars but can be up to $50,000 in some cases for corporations and even a custodial sentence. Maybe those who don't/can't pay should get a custodial sentence. There are also fines for breaching social distancing and restaurants etc can be fined substantially for breaching their Covid safe plan.
Just discovered my home not on UK Land Registry



