There’s a special place in hell for the people who think they can avoid the travel quarantine by using loopholes in the legislation. 
I know of someone (a family of 5) who are relocating back to NI next month. They are travelling from a country with a high number of cases and deaths - the virus is still very prevalent there. They will also be travelling on 2 flights to get home.
They are flying into Dub and immediately coming north. They will be returning to their old house and one member of the family will be starting a new job 3 days after they return.
They will not be self isolating because the ROI rules do not apply if you are coming north of the border, and the UK rules which are expected to be in place before they fly won’t apply either because they only arrived in the UK by car and not by air, sea or rail.
They are positively gleeful at this loophole and are planning to catch up with their friends and family on their return, go shopping (to wherever is open) to restock their house with food and toys etc, and begin work immediately.
I am betting they won’t be the only ones doing this. I feel sick at the thought of who they could potentially infect.
We will NOT be seeing them for several weeks after they return and will also not be seeing anyone else who sees them.
Surely there needs to be an understanding of this and a way to close the loophole.