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
CORRECTION: THESE TUBES SHOULD HAVE BEEN FIXED AT 45 DEGREES. SEE POST #535 for the correct method.
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