Thanks for the replies guys, to answer a couple of questions:
The collars on the demo boat are 16" diameter but these of course can of be supplied at any size required should 16" be too large.
50HP is the max rating for the hull, the boat has been commonly supplied in the past with 25-40HP units.
The boat is supplied with RCD rating 'C' with max 6 people and 50HP outboard.
As for speed we will get back to you as our handheld GPS has a fault so will see next time were out, safe to say its fast enough.
We will update the website with useful HP range as i understand how this information would be of help to people looking, thanks for the feedback