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Okay, so!
Any UK anons looking for aurora/iridescent film to use in visors, search on eBay for "adheisive dichroic film". You'll get a bunch of results for Windows. You can order a 4inchx4inch sample from them for 99p and free shipping.
This is what it looks like on a visor. RE: the poor crop, I've just snipped it with scissors to get a rough idea of how it looks, and I'm pretty impressed. As always, the effect is better in person blah blah blah.