The calculated distance (air line) between Stratford-upon-Avon and Attleborough is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Attleborough is certainly longer, as only the direct route (as the crow flies) between Stratford-upon-Avon and Attleborough has been calculated here.
Air line (approximately)
40 kilometers
21 nautical miles