Another new bit!
Although I probably don't need it... Where have we heard that before? Well, I remembered that the fuel cap gasket was a little aged and with the tank brimmed I had had a slight leak when on the sidestand. The remedy? Buy a new rubber for the filler cap. I toyed with the entire cap. But as it is out of sight under the flap I decided not to bother and just get the rubber. Another part from https://www.suzytwo.co.uk/