I think this has come up before, but Whittlesey on the Peterborough-March line, the station spells it Whittlesea. However since some other Fenland villages in this region are spelled Manea and Stonea, pronounced 'maney' and 'stoney' respectively, then possibly Whittlesey was spelt this way when the line was built and whereas the local spelling has changed to the more conventional over the years, the railway nameboards being produced centrally and changed by various railway companies and BR over the years will keep to the original spelling.