Steph... A safety thought if you go the route of 'hot wiring' the coils...
Do not set off until you are comfortable with just how you're going to stop the engine if needed! My #1 suggestion would be to simply apply full choke; and #2 would be to just drop the clutch with the brakes on. But again, please do consider this / check < you go riding...
Another trouble shooting option might be to get a small 12v (low wattage) bulb & mount it near the warning panel. Earth one side, and take the other side down to the coils black / white feed. Basically, anytime this bulb is lit means the coils are being supplied, if the light goes out as the bike dies... well it confirms a problem in the +ve supply to the coils. If you don't have a bulb handy just 'borrow' a neutral or hi beam or inst illumination lamp.
A little way off the NF, & in Oakley / Basingstoke. But worsened in that I work abroad so just not out on them roads anything like what I want. Was down in Lymmington for a couple of nights recently.. it certainly is a nice part of the country for biking.
Take care, it's not a nice fault this one...
Simon