I managed to grab a couple of hours today so had a go at removing the tank, I had already cut the foam around the sides of the tank but the foam underneath did not want to let go, but it finally let go
Next job will be cutting the foam under the deck from where the new console will go to the stern ready to install the cable/service ducts as I want to keep the deck totally free of obstrucions.
Pic 1 The deck cut around the tank
Pic 2 Free from the foam at last
Pic 3 Out at last
Pic 4 The hole where the tank was
Pic 5 The tank after removal.