The calculated distance (air line) between Bidford-on-Avon and Birkenhead is approximately 97 miles respectively 157 kilometers.
By car or train, the actual journey to Birkenhead is certainly longer, as only the direct route (as the crow flies) between Bidford-on-Avon and Birkenhead has been calculated here.
Air line (approximately)
157 kilometers
85 nautical miles