I can't thank you enough for your response - the things I've learned from your one single post are more useful than most other things I've picked up in a full series of videos and hours of tinkering.

I'm almost there I think, but rather than making the whole project driven by the scaffolder I think I'm going to try and make it driven by the roofer, as they're the most likely to suffer problems related to their capacity.

Would you mind if I kept this thread alive, so I can give updates and post when I have new issues as the project goes on?

Thanks again, you're an absolute life saver.