The calculated distance (air line) between Bishopstoke and Southend-on-Sea is approximately 97 miles respectively 156 kilometers.
By car or train, the actual journey to Southend-on-Sea is certainly longer, as only the direct route (as the crow flies) between Bishopstoke and Southend-on-Sea has been calculated here.
Air line (approximately)
156 kilometers
84 nautical miles