Hello all!
Thanks for your speedy replies, sadly I've been at college and have been unable to reply...
Basically, I don't really think that there is anyone over 18 who would be willing to go... But that is something I can always check. As someone said, the terms & conditions have been confirmed by someone from hoseasons after I emailed them, the reply said this, "As per our Terms and Conditions of hire there has to be 2 adults over the age of 18 in every party, also some boatyards may not allow young groups, family parties only. Kind Regards."
So following on from that would it still be worth asking directly to a boatyard?
Once again, thank you all!