Just a little update on this one, I ordered a new second hand lockset proper Suzuki one this time. Swapped over the ignition and still got the shame fault. Disconnected the battery and left it over night, next morning connected the battery back up and it fired up but with a C28 fault so it was tank and air box off again. The butterfly on the front tb was pretty stiff so a couple of squirts of lube and all is good again, running with no faults showing.