Thanks to Trish and Toby for this brilliant find.
Autobarn have a windscreen sun shield for sale. The brand is Streetwise, it has silver on both sides, it is folded concertina-like around 600mm by 140mm and opens out, giving a good expanse of foil fabric to cut up.
It cost $5. Perfect!
Author: RedlightsontheBrain
Redlightsonthebrain is written by Catherine Hamilton, a retired doctor to help people to learn about neurogenerative diseases and the practical, safe and scientifically-based things that can help improve life. Part of this is to provide low-cost access to red light devices, hence the DIY instructions on this blog.
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Red lights on the brain 