Ta!!
Many thanks, there's always an answer if you ask the right chap.
Just out of interest I used to fly the Sikorsky S61N on the North Sea. When I first started flying it, it was rated as an amphibian and base checks required landing and rejected takeoffs onto water. A few years later they decided it was not suitable - it leaked a lot - and it lost its amphibian rating! Single engine rejects onto water were very flattering.