Says in the description
B1057 from Haverhill to Steeple Bumpstead in that clip. More of the same through to Finchingfield - https://goo.gl/maps/fPSrj3M45sK2
There's probably a loop to be made there if you go up to Saffron Walden, some nice roads over to Haverhill, down to Finchingfield and then you can cut back across through The Bardfields, Henham area ish.
I prefer the sound of my adapted turbo Fujitsubo Legalis R, but it's just too noisy for daily use. Was fun for a while though! The Janspeed is only loud when you want it to be, compared to pushing the car round the corner on show mornings what for not p1$$ing off the neighbours at 5am with the Fujitsubo on.
Fujitsubo with mic placed in the rear number plate recess - https://www.youtube.com/watch?v=cqqeC-HF0UI
Same positioning with a different mic. Must do Snetterton again with rear tyres that aren't xxxxx! https://www.youtube.com/watch?v=8Md1ZG0AbnE