Thanks Bogs,
As to the amperage draw, with the boat held static in the water, engines running flat out on 14.4 volts, the amperage reading with a "Fluke" amprobe barely reaches 1.5 amps per leg ... partly I suspect, due to the prop wash, or the inability of the water to fill the airspace left by the rotating blade in the water at full rpm; but also I think, maybe due to these motors not being fully loaded by the resistance of the propeller as it rotates in the water.
As to the cost of the motors, don't actually remember just how much they were, but don't believe they were as much as 40 pounds. And yes, much importation of goodies from old Blighty. they do seem to have the modeling industry covered better than the US, at least for the scale modeling fraternity. That of course is the beauty of the internet, it's a very small world now, thank heavens, for the hobby shops round here only cater to the R/C planes, helicopters, cars, or buzz boats. They are also priced a bit more favourably compared to the US hobby suppliers, including the postage or freight charges, (when shipping overseas, as your own previous comments on the subject testify to).