Probably should start a new topic then.
I had a full fairing recumbent trike with a 6000w motor, around 1kwh of lithium, turn signals, running lights, 3 wheel braking, etc. etc. and had a lot of fun with it, but my life was not set up in such a way as to put it to good use.
The last folding bike I owned I found got really squirrelly above around 12mph, and ran out of gearing around there too. My preferred cruising speed is around 20mph. I'll have to take your word on Bromptons, I've never owned one.