The Secret Service is the least known of Gerry Anderson's 1960s puppet series, and it was the last to be made by Century 21. Misunderstood by Gerry's backer Sir Lew Grade, he cancelled the series mid-way through its run. Only a handful of the ITV regions screened it, and I don't think it even made its way over to the US.
I bought the Dinky version of Gabriel's car when asked by Fanderson to do some shots to illustration a new story that was being published in their new Secret Service annual for Christmas 2021. I had to modify and scratch-build a canopy hood to reflect how the model looked more often in the series with it up rather than down.