> Is the trigger transformer close to the bulb?

http://home.clear.net.nz/pages/joecolquitt/flash_proto.jpg

I've super-imposed the tracks. It's a fairly simple layout to follow

> Any chance of arcing from the trigger wire

I don't think so

> Did you try to reverse the two main electrodes of the bulb?

No

> At this point a problem with the trigger transformer seems likely

The two things I haven't replaced are the transformer and the bulb. I
very nearly went into town today to buy 10 of each but I called ahead
and they couldn't help with the transformers, so I didn't go. I've just
the one of each therefore. 

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