This is sad, but I have just dug out my Mk2 OCU notes! The following paragraphs also appear in the Aircrew Manual:
External Power supplies
200 Volt AC Ground Power Units.........the 6 pin snatch disconnect plug is in the port wing root......
28 Volt DC Ground Supply A 28 volt, quick disconnect ground supply plug is in the port wing root angled rearwards. This supply feeds all ground service lighting, all normal 28 volt services and, if the battery switch is ON, charges the battery......
For ground refuelling only, a separate 28 volt supply may be plugged in on the starboard side of the nose. This isolates the gound refuelling circuits from the normal 28 volt system, which remains de-energised during refuelling.
That would seem to settle it, the sun and waccy baccy hasn't done for Waddo Liney's after all!
YS
