Got a good deal on two tins of 'Servisol 10 ' contact cleaner and lube, and applied generously to every connector on Muddy's old bike. The relays under the seat were glad of it, as were the connectors behind the headstock....probably because the bikes been unsed for a year on my driveway and in the garage. Everything works perfectly now, so I just have a front end rebuild ahead 
<p style="text-align:center;">Ohlins, PC3, fuel cut defeat, +4deg timing, 17" front wheel.