The calculated distance (air line) between Stoke-on-Trent and South Croydon is approximately 144 miles respectively 232 kilometers.
By car or train, the actual journey to South Croydon is certainly longer, as only the direct route (as the crow flies) between Stoke-on-Trent and South Croydon has been calculated here.
Air line (approximately)
232 kilometers
125 nautical miles