Well done evansvb
The challenge photo comes from a copy of Flight May 1939 and refers to it as the Reid And Sigrist Twin Engined Three Seater (Trainer)
No mention of Snargasher in the article... but it's such a great name I hope it's the same thing.
BTW... Mel sent me this....
"According to a short item in the September 1976 issue of Air International
the name "snargasher" was applied to the R.S.1 by the factory workers during its construction and had no meaning other than as a "family joke".
You have control