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'Nitrile rubber sheet' was what I used, e.g. https://www.ebay.co.uk/itm/Oil-Resistant-Nitrile-Rubber-Sheet-Various-thicknesses-and-sizes-/121409645732 - looking at my email I bought an A4 sheet of 2mm rubber for about £3.50, which was enough for front and rear flaps. It's reasonably floppy, but has held up for over 3 years now.
Anyone know what I should search for to make some decent quality mud flaps. I'm thinking 1.5mm polypropylene or similar but that doesn't turn much up on Ebay.