Thanks for the feedback, Robin and Patrick.
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This week I've finished covering the dashboard surround so I've PU glued the demister pipes back in again.
Demister pipe by
Sabrebuilder, on Flickr
And, I've made up these little adapters to connect the demist hoses to the Sierra heater box. I Araldited the tubes into the plywood bases before giving them a coat of black paint.
Demister heater adapters by
Sabrebuilder, on Flickr
I'm planning on fitting my windscreen glass before re-fitting the dashboard surround as it's easier access to both sides and I don't want to get the windscreen adhesive on the dash surround.
Stay safe.................peter