They are seaworthy boats and very solid. They don't slam in heavy seas (couldn't get mine to anyway) and seem very stable. Been out in about 8 to 9 foot waves in mine and it seemed like it could handle more. I have even read reports somewhere that some have crossed the North sea but that is optimistic for any boat in this size bracket.
Engines: Now the problems. Most seem to have Perkins 4107/4108's fitted. Apparently spares are getting VERY thin on the ground now and I have been told on several ocasions (by owners and mechanics) to keep away from these as it's only going to get worse. Some (but not many) were fitted with BMC engines. These also are suffering from spares now cos thats what I had in mine and couldn't get very many spares for that.
There are some spares for both these engines but not many.
If the engines are in good condition then they are great engines but if you have any major problems with them your in for trouble.
This is a shame as they are very good boats but you will be looking at re-engine it sooner rather than later (not cheap).
My opinion: Go for it. Loverly boats but be prepared to spend a few quid on the engines.
My little book ses this model was launched at LBC in 1970 and over 400 were built up to 1981.(25 years of Motor Cruisers) 1960-1984.
Came with pair of 50hp Thornycroft or Perkins.Max about 12-13 knots.
Three quarter lenght keel with shallow V.
Length 30ft
Draught 2ft 9 inches.
Beam 11ft 6 inches.
Guy next to me has one and it is a lovely boat. He has spent some cash on it this season - engine repairs and such but no more than anyone else i guess. It used to cross the North Channel and Irish Sea apparently with previous owner, and looking at it, I am sure that it managed seas easily. There is a bit of woodwork on these boats of course so it will be fairly high maintainance - ok if you don't mind the scraper and varnish pot. Best of luck. Roy