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davesparks
Pyro is new to me, and from what they've been saying and showing me, its awful stuff - especially when it ancient like ours.
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It’s not awful stuff at all, it’s a pretty versatile and very resilient type of cable.
Working with it is a less common skill these days and these people telling you it is ‘awful stuff’ suggests that maybe they don’t have the skills.
Someone with the relevant experience, and maybe a little lateral thinking should have no problem doing the job safely and in full compliance with the regulations. Although whoever does it and however they do it there will have to be a bit of a hole made in the plaster to access the glands and cable.