I'm grateful for all comments & your views and comments are very helpful, it's interesting hearing what works or doesn't for some people, for example the Halogen Hob, why won't it work in the summer months when there (hopefully) will be a surplus of solar energy going spare?
As for 'Careful, you’ll be accused of criticising the OP' , please don't worry, I'm not accusing anyone of criticising my ideas, indeed all opinions are most welcome. However what suits one person may not suit the next, it doesn't mean that only one way is right.
I'm not really worried about future resale value either, in fact the lack of gas on board a boat is a tick in favor in my book.