The calculated distance (air line) between Norwich and Walton-on-the-Naze is approximately 54 miles respectively 87 kilometers.
By car or train, the actual journey to Walton-on-the-Naze is certainly longer, as only the direct route (as the crow flies) between Norwich and Walton-on-the-Naze has been calculated here.
Air line (approximately)
87 kilometers
47 nautical miles