Magic Merlin

Possibly this one from the Boat Index -

 

"Magic Merlin Built by Cheesman Rollo in 1980 - Length : 10.9 metres (35 feet 9 inches) - Beam : 3.7 metres (12 feet 2 inches). Powered by an Inboard Diesel engine with a capacity of 1800 CC. Registered with Environment Authority - Thames Region number L0461 as a Non Hire Annual Private Motor Boat. (Last updated on Friday 20th April 2012)."

Done