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Howard
It's a Dutch thing (I know, because I have a Batavus that weights 40kg and rides like a dream, and which has the Woods valve). One of these adapters will fix your problem: https://www.ebay.co.uk/itm/274726413737?hash=item3ff6f865a9:g:ul4AAOSwKBBgjFGL
See also https://www.dutchbikeshop.co.uk/pump-tyres-dutch-bike