Poor cold start, clicking relay in cabin.

[highroof]

Ok,this is on a '59 plate 110 Limited. I had a problem a couple of years ago with starting from cold, solved easily when I spotted that the metal post that supplies the feed from the ignition live had snapped. Fixed that, but it's playing up again now for reasons not immediately obvious. Would one knackered glow plug cause a problem?

Doubt it's a related problem, but I've got a relay in the passenger side clicking every 8 - 10 seconds when the van's running. It's possible that the rear wiper switch is turned on ( just thought of this ), even though the wipers themselves are disconnected in the doors ( rear doors are internally boarded, so no need for them ), and I'll check this in the morning, failing that, anything else to check?