The calculated distance (air line) between Stratford-upon-Avon and Birkenhead is approximately 99 miles respectively 160 kilometers.
By car or train, the actual journey to Birkenhead is certainly longer, as only the direct route (as the crow flies) between Stratford-upon-Avon and Birkenhead has been calculated here.
Air line (approximately)
160 kilometers
86 nautical miles