Yes Danny it is a Sonnett but it was a Sonnett 2 but never really called that, just a Sonnett V4. It was one of my Dads company cars that were shared in the fleet, the bump on the hood is the clue to the V4 power plant.
When they offered the series 111 car it had a four on the later in production.
I went to the SAS terminal at Kennedy Airport with him to pick up the first two stoke Sonnett for the New York Auto Show. They had actually produced a Sonnett 1 which was an open car like your Spyder. There was one that sat for years in East Haven Connecticut at the back of the garage when they were head quartered for many years before moving to Orange Connecticut.