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Squaredisk-
So a plain groundsheet cut rough to size will work and I could just buy a section of tyvek or maybe this stuff: https://www.ebay.co.uk/itm/402451476051?hash=item5db3fa2e53:g:T4oAAOSw8-VgOAfr
290cm x 132cm
5m x 150cm of this poly stuff costs £25
polycro?
https://www.99boulders.com/best-groundsheetsThis guy does Tyvek sheet: https://www.ebay.co.uk/itm/282511928071
hippy
Also, with a groundsheet/footprint - does it need to be pegged down? If it's roughly the size of your tent floor anyway, it's not likely to catch much wind (unless you do what I want to do and extend it into the vestibule area - that might need pegging.