The calculated distance (air line) between Grange Hill and Purfleet-on-Thames is approximately 11 miles respectively 18 kilometers.
By car or train, the actual journey to Purfleet-on-Thames is certainly longer, as only the direct route (as the crow flies) between Grange Hill and Purfleet-on-Thames has been calculated here.
Air line (approximately)
18 kilometers
10 nautical miles