The leak was not the Bow Thruster
after all. I got in there this morning whilst underway having wiped it all dry. There was 10 knots of breeze and we were sailing nicely at 6 knots.
The leak is from the hatch drain, where it enters the BT glass box. As we pitched there was a drip. So I siliconed it and dried it all again. When we get in tomorrow I will be able to confirm.
Amelia in passage to Ibiza