[ QUOTE ]
The boat I'm talking about is under GBP100K.
[/ QUOTE ]In this case, it's bound to be a RIB.
There are plenty which meet and exceed all your previous criterias, 'cept one: the "comfortably" bit.
Unless by comfortably you mean that they just have somewhere to seat.
"Imagine the sensation of blasting off in an Italian sports car, as the G-forces press you back into the seat. Now imagine doing the same thing in nearly 6,000 pounds of American pontoon boat. That's what happened to us during our never-a-dull-moment test of the Boundary Waters 310. With 600 horses galloping, we went from zero to 30 mph in just four seconds! Up until that point, we were still gawking over the 310 square feet of deck space — truly amazing."