ElectricMotorcycleForum.com

Your situation was similar to mine back in 2016. Only Lexham would insure my FXZ 6.5 and only 3rd party accident, no fire or theft cover. Over 9yrs no claims with a Kawasaki Z750 counted for nothing, had to start again with no claims bonus. Here's how it went, 2016 £842.00p. 2017 £711.38p. 2018 £308.74 mentioning i had 2yrs no claims bonus, so you can see they are not out to exploit their virtual monopoly, you just have to stay with them and build a no claims discount. I only got insured with them by sending photos of my rented concrete steel door garage with CCTV and security gates, then in late 2018 the council demolished it to make way for estate regeneration. The bikes in storage now.

Tracked down this fault to the front brake lever micro switch. The rubber dirt and moisture  seal around the push button was constricting movement, making the contacts after a few seconds instead of instantly. Not what you want in a switch as slow separation leads to arcing and oxidation on the contact surfaces which is what i found. The switch can be taken apart as the top part clips on to the body that has the mechanism, cleaned it with contact cleaning strips (never use abrasive paper or scrapers) you can use leather for this as well.
Take extreme care when the top is unclipped as the contact is only held by a spring and it's murder to get it back in place, it's so small. It appears that a standard sub minature micro switch is a direct replacement as the mounting holes and push button location match. Its all back working fast now minus most of the seal that was causing the slow down. Incidently the loom wiring connections are sound, Zero have done a quality job on that score.