Tank off, pipes checked/blown clear, refitted, fuel on/off/on, and lo and behold she started - thanks to all who posted helpful info.
So, I then decided to have a go at the non-bleeding front brake issue. Fitted one of these (thanks Carl for the tip), new banjo with bleed nipple:

Five minutes bleeding the m/c and pressure was building nicely. Then bled both calipers using a tube/oneway valve and all is good! Very slight binding but that may be the new pads need bedding in.
Thanks again to everyone - not only does it now go, it stops too!


Now, where's my Dremel and that right hand exhaust.......