A Quick Look at Wigram's Turn (AKA Napton Junction) 

Wigram's Turn on the South Oxford Canal, also known as Napton Junction, is where the Grand Union meets the Oxford. From here to Braunston the GU and the Oxford share the same course. You'll often see it written as 'Wigrams', without the apostrophe, to the best of my knowledge both will do these days but the name derives from the first toll keeper in 1800, John Wiggerham.