Just for other peoples information, the bike still started even with the fuel pump electrical plug disconnected!
Ok, battery voltage after 3 days standing is 12.7 when off so that’s healthy. I drained the fuel bowls and no water in the fuel. Pump whirred up and she fired up with no problems which is quite annoying as I still have no idea why she wouldn’t start 3 days ago.
I did check the air filter too and it’s filthy and black and the sponge is starting to come off on the inside. It’s a pipercross filter that Mike fitted about 6 years ago when he Ivanised the bike. I do clean it yearly but it’s so bad this time I’ve just ordered a new one.
I’ve also cleaned the connector going into the Cdi unit and put electrical insulation grease in the contacts to protect it from the damp.