So finally got fuses in and most of the wiring dialed up. Started the van on the key and as soon as it's released from position 3, van cut out...
So, recheck the wiring, earth's etc etc etc...
Got spark, got fuel blah blah.
Eventually sipped the ignition and it appears the switch is shot - 48 years of wear and tear has taken it''s toll.
New switch ordered and back at it over the weekend.