Hi, think the one on the south coast you are refering to is north shore, better known for producing Fisher Yachts although they did dabble in ribs in the mid 90s. Nothing to write home about. Or it could be BWM Ribs who share hull linage with Northcraft as I think they both bought moulds from a cheshire company in the late 80s.
Osprey, great ribs (and IMHO still one of the best handling hulls around) although now at a premium, price but loved by the Europeans. Considering the number build suprisingly few come onto the second hand market as owners tend to hold on to them, nuff said ?