From my First Flights database:
May 11, 1939
Desford Aerodrome, Leics., UK
3-seat twin-engined monoplane trainer proposal
Reid & Sigrist RS.1 Snargasher prototype (no subsequent production)
c/n 1 G-AEOD
2 x 205hp DH Gipsy Six II Series II piston engines driving 2-blade propellers
Designer: W/Cdr George Lowdell
Plywood/wood construction.
First public appearance at the Heathrow garden Party of the Royal Aeronautical Society 15/5/39, CofA issued 3/6/39. Used for manufacturer’s communications during 1939-44.
Scrapped 1944.

300 kb max size nowadays.
Sure look like Wellingtons! I guess they would have been Mk XIX.

I suggest that those interested in this claim read the refutation published on pages 498-501 of “The Bishop’s Boys” by very well respected author Tom Crouch. He has convinced me at least that the claim by Weisskopf to be the first to fly is utterly unfounded.
The Wrights did not buy an engine from him either!

I’m interested too, Mike, but surely all our American friends are fast asleep just now!

Short Brothers S.538

This was a specially built variant of the Shirl (as the Air Ministry refused to lend the 3rd prototype N112 for an Atlantic attempt). It had increased wing area and a large external fuel tank giving a still-air range of 3,200 miles, the total fuel tankage being 435 gallons of petrol.
It was completed at Rochester at the end of March 1919 and was powered by a RR Eagle VIII low compression engine. It was unregisteredbut was adorned with roundels and a Union Jack.
On 18 April 1919, named the Shamrock, it took off from Eastchurch to fly to The Curragh from where the Atlantic attempt was to start. 12 miles out to sea from Holyhead the engine stopped and the pilot Major J C P Wood turned back to try to glide to land, but had to ditch about a mile off Anglesey.
The Shamrock floated for 22 hours before being towed to Holyhead and beached.A quick overhaul was not possible however, and the prize was won by Alcock and Brown in July that year. The Shamrock was then abandoned.
(abbreviated version of text from “Shorts Aircraft since 1900” by C.H. Barnes)

According to Bill Gunston in his book “The Development of Piston Aero Engines” (page 115), “Salmsons . . . were the only really successful water-cooled radials”.

If only I lived in the UK . . .