If I fly (for example) from Madrid to the UK, I am required to go straight from the airport to my home and then stay at home for 2 weeks apart from a few exceptions - funeral, court, medical need or buy food if I can't get a delivery from Tesco or a friend to help. Anything else and I'm liable for a £1000 fine if PC Plod decides I'm not self isolating without good reason
How exactly does taking a plane to France in that 2 week period count as self isolating or having good reason ? I'm not trying to argue the merits of the idea of self isolation - more that I don't see how a period of self isolation is compatible with leaving the country in the middle of the 14 days