Sorry. I know this is an old thread.
With regards to the Davison Brothers Boat Builders. I actually own one of their 30 foot short boats. Needless to say mine was renamed to Flying Fox a great number of years ago. Not sure when she was registered but the previous owners said around 1974.
She has been well looked after, never had mains electrics installed and never overplated. Last out of the water survey showed a minimum hull thickness 5.4mm so she has stood the test of time.
I know that some people get her confused with Fox Boat Builders, because of the name.
So I thought I would also post a photo of her.