England and Wales Major Trauma Centres, showing isochrone for travel time by road (assuming normal traffic, not assuming the speed an ambulance could travel). Catchment populations are estimated by looking at the LSOA's that fall into each isochrone and selecting the closest (by travel time, then by as-the-crow-flies distance) MTC. Code: https://gist.github.com/tomjemmett/869c6b9f6e363c18cfe5119912aab7ea

Estimates of the Catchment Area populations for the Major Trauma Centres in England and Wales, based off of the LSOA population estimates, and assigning each LSOA to the nearest MTC.