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JurekB
if you're London based then Denny Plastics are super helpful, reasonable, and White City based, so you could go up there and see it in person
https://www.dennyplastics.co.uk/
Lovely guys
imo 20mm is far thicker than you need. Depending on how it's mounted I'd expect 6mm+ to be fine. But ask the supplier, they usually know what they're talking about