Interesting, so as long as you are leaving your isolation address to head to the airport and start another trip you can cut short the 14 days? You can just keep heading off on new trips even when you have been back for less than 14 days?
Section 4.
...
(7) P must, on their arrival in England, travel directly to the place at which they are to self-isolate, and must then self-isolate until whichever is the earlier of—
(a) the end of the 14th day after the day on which they arrive in the common travel area, or
(b) their departure from England.
...
(9) During the period of their self-isolation, P may not leave, or be outside of, the place where P
is self-isolating except—
(a) to travel in order to leave England, provided that they do so directly,
EDIT: or of you were doing an overnight connection you wouldn't have to remain at the hotel for 14 days, you could just head to the airport the next day and continue your trip?
This whole thing seems like a complete farce!