Come up Chapel Hill, and then turn right into St John's Road. The church is about half way down. Alternatively, you can come to St John's Road from the other direction, via Brewery Lane on lower Street.
Exit right at the roundabout where the A120 hits the B1383. Come all the way up the hill, turn right into Chapel Hill, and St John's Road will be on your left about half way down. If you are coming off the M11, join the A120 at Birchanger Green Roundabout, following directions to Bishops Stortford until you get to the B1383.
Stansted Mountfitchet is on a regular line from London Liverpool Street to Cambridge. Walk up Station Road to the roundabout, then up Chapel Hill until you see the church on your left.