100% it's on the Island.
It stalks us, like a stalky thing. Follows us wherever we are. Ooooooooeeer! You can run but you can't hide 🤣
The best we can hope to do is slow the rate of progression for all variants just by doing sensible stuff, not just variant 15.
When our kids were little (30 & 40 years ago) and always running around with snotty noses and coughing all over the place they never visited the grandparents. It was the sensible thing to do until we thought the lurgy had passed. The same with both of us whilst working... if we had the same colds/coughs then we stayed away from parents and work, for however long it took to get rid of it. Sometimes it was just a couple of days, other times it could be a week. It's just common sense.