In reply to Dave the Rave:
You do know that ventile is manufactured in Switzerland?
From wikipedia:
Currently the only manufacturer of this specification of cotton textile is Stotz & Co AG,[3] where they spin, twist, weave and dye the raw materials in their native Switzerland, and sell the textile directly under their own branding of etaProof[4] cotton; supplying clothing manufacturers and wholesale textile distributors globally.
British production of Ventile eventually ended in the late 20th century[5] but the trademark continues to be used by the British company Talbot Weaving (Chorley) Ltd[6] to market their wholesale distribution of etaProof cotton fabrics. Alternative registered trademarks, owned by other commercial organisations used to market, promote or distribute the fabric, include Supermarine[7] and Duuton3.[2]