The calculated distance (air line) between Northam and Stoke-on-Trent is approximately 161 miles respectively 259 kilometers.
By car or train, the actual journey to Stoke-on-Trent is certainly longer, as only the direct route (as the crow flies) between Northam and Stoke-on-Trent has been calculated here.
Air line (approximately)
259 kilometers
140 nautical miles