Draw a 25 mile circle on a map centred on Southend-on-Sea and about a third of what falls inside it is water, and another slice is the wrong side of that water. The Kent shore sits around 8 miles away across the estuary. By road it is 45 to 60 miles, because the nearest crossing is at Dartford and you have to drive west along one bank and back east along the other. A circle on a map says Kent is closer than Chelmsford. A satnav says the opposite, and the satnav is the one that decides whether a survey and an installation can happen in the same week.
So the service area below is built on driving time, not on compass distance. The A127 and the A13 run east to west along the two sides of the peninsula and carry most of the traffic between the city and the Basildon and Thurrock belt. The A130 and the A12 take you north towards Chelmsford and the Dengie side. Between them, they stretch our reach a long way east and west and shorten it considerably to the south. Places that look remote on paper, up towards the Crouch and the Blackwater, are often a straightforward run up a single road. Places that look adjacent can be an hour of estuary detour.
The mileage figure attached to each place in the listing is a road figure for that reason. It tells you something useful about a morning start time. A crow-flies number would not.
