It will cos you but if you are unsure get a check done on it...boat version of a m.o.t test really...total guess at price but £250 should cover it i would think for a small boat.
Mine came from the south coast as lots more choice and cheaper but then you need to take the transport cost into account when getting her up her anything from £500-£1000 depending on size etc. Even if you do it on your own i guess the fuel would be about £140 round trip.
6M Quicksilver next to me for sale at the moment in the Royal Quays, just under 9k, a Arvor 18 for £14,500 i think and a few others also.