Sundon  Sundon is a civil parish in the English county of Bedfordshire. There are two settlements: the one called Upper Sundon at the top of the hill is now the main village, and the presumably older one by the church is now a hamlet called Lower Sundon. Because of changes to its boundary, the parish no longer includes Sundon Park (which is now an area of Luton) or the "Sundon Substation" of the National Grid for electricity (which lies west of the railway, near the village of Chalton).