..on how good a friend and how much you want to spend. And does he (or she) already have a boat.
If boat owner, and it's petrol (are you a friend of BarryD), then a tankful, say 100 galls of petrol will likely set you back £400. Or a voucher from one of the Chandlery chains for spending at London Boat Show in Jan. Or maybe tickets for LBS?
Or if you're loaded and friend doesn't have a boat Fairline\Sunseeker etc will sell you a voucher for new Squadron\Predator. If you are planning to spend that amount, are you interested in a new friend?
I have a voucher for £158.42 expires 31.10.02 to be spent only at Shamrock Chandlery in Soton. It's from their "spend this much and we give you a voucher for that much" loyalty scheme. It's one voucher, I cant split it. Will sell for £110 and I'll include my Shamrock identity plastic card so you can pretend to be me when you go to spend it! Promise full refund if they figure out it's you and not me (by retina scan or something) and you get arrested when you try to spend it!!