Thanks for the posts gents, unfortunately I seemed to have made a basic error,
the boat is indeed 1/12 and I measured the internal dimensions of the wheelhouse for the figure Therine, without remembering that I raised the wheelhouse floor in relation to the superstructure to allow for a much bigger battery, this is how I arrived at the 4" figure size.
6" is indeed the correct scale size for the figure, I will have to try and obtain a seated figure

Sorry to give you all the wrong info and to waste your time.