Its an SSDR according to G-info, so it has to be up to 300kg max weight.
https://www.bmaa.org/information-library/ssdr
Also max stall speed of 35kt. I can’t really find any more info about this plane online.
The OP aircraft lives in North Wales, the builder has spent considerable sums and the build quality appears good. I don’t think the builder has found an intrepid pilot to take it on a test flight! The test pilot would need to have the skill to deal with any stability or CofG issues that might be uncovered on the maiden flight.
300N x 4 = 1200N
With a 300kg aircraft, the acceleration would be about 0.4G. That’s a lot!
RobertL18C wrote:
The test pilot would need to have the skill to deal with any stability or CofG issues that might be uncovered on the maiden flight.
I am not the expert (that would be @PilotDar ) but I did manage one test flight program for an experimental aircraft: what the pilot needs is the knowledge to validate the stability & control calculations done by the builder/designer…before he takes it up for a flight
One major difference with the SF-1 is the horizontal stabilizer-less design. This makes stability and control very dependant on aerodynamic profile design and building accuracy , (items which are mostly masked with a stabilizer) although wing sweep does help.
It reminds me of this one too:
Wannabe fighter pilots
Noise it will do, speed and G-forces, who knows?
I recall one ex-RAF Tonka driver used to wear a G-flying suit in the gliding club house everytime he intends to fly his PHP Shark Jet glider, he was banned from takeoffs with his engine 
It’s a (silent) gliding club in Oxfordshire not RAF base
I can’t really find any more info about this plane online.
It’s classified, I can tell you but I have to kill you first
Someone based where we saw it says it does fly.
Peter wrote:
says it does fly
Good. Now the question arises… is it reusable?
@Peter last time I was there the local CFI, very nice helpful gentlemen, told me it has never flown
