@lia thanks for getting back to me on this. I did speak to them and they said all warranty claims have to go directly through future motion and I'd need to submit a support ticket there myself... :( not sure if things have changed since your friend got that sorted but they have said they're not allowed to do anything.
I don't suppose anyone here knows of any UK based onewheel repair places? I'd really rather not send back to FM. Wish I'd listened to all of the terrible stories about their service but then, I didn't expect my board to no longer turn on after only 30 days... :(