Try a commercial vehicle factors ? Or a large hgv workshop type place. Used to be sold by them, not sure it still is.
http://www.elementsfires.co.uk/product-category/bioethanol/ They would know of stockist for the fuel. https://ekofuel.org/where-to-buy-bio-ethanol https://your.morrisons.com/Home-New...-First-Biothanol-E85-Fuel-Pump-in-Johnstone-/