Please note that where Church Hill becomes to a fork (Prospect Hill/Church Hill). You must turn right into a cul-de-sac with the church and its car park at the end. There is a zebra crossing just before the turn (if you are traveling eastward, i.e. l to r!) There is a red box round the church. Parking is very limited on the South side of the church.
On foot from Walthamstow Central, walk up St Mary Road. It appears to be a dead end, but you can walk through Church Path to Church End.