Out on the bike yesterday and the battery light comes on then about 10 miles in the FI warning light came on and the bike starting popping/spluttering and then a few more miles she cut out.

Haven't had chance to investigate as I've had to leave the bike at my dads and head to work in the car, i work away through the week.

Before leaving I did stick the charger on, as expected it said the battery was flat as a dodo.

If theres a strong chance it is the RR then I could do with ordering one so i can have it for the weekend to fix the bike but I don't want to fork out a wedge of cash if its likely to be a different problem

I have a spare that you can try before you buy, if that helps.