So after months sat in the garage I nipped put yesterday and the fuel light came on when I got home. Today I nipped out and got petrol, the fuel light stayed on and gauge never moved even though I filled it up. Riding around and stopping after 10 miles to admire the view I hopped back on and the fuel,light was not on and the gauge almost at full, after a few minutes it registered full. Moral of the story, get out on your bike or leave the tank full. I might nip out tomorrow to double check it still works.
All the front body panels off the bike including the nose cone. Disconnect and remove fuel tank and then 10 seconds to replace the fuel sensor and then put everything back on!