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Hadlow Down is a village in the Wealden District of East Sussex. It is located on the A272 road three miles north-east of Heathfield. The parish is within the High Weald Area of Outstanding Natural Beauty. It came to prominence with the Wealden iron industry in the 17th and 18th centuries.
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In 1835 the Earl and Countess de la Warr gave land for a church in Hadlow Down, and the Prime Minister, Lord Liverpool, contributed £100. The church was consecrated in 1836, however, it was demolished in the early 20th Century retaining the tower and walls of the nave, and a new structure erected incorporating a fine new chancel and chapel. It was dedicated to St Mark in 1913. The rebuilding was at the expense of Charles Lang Huggins of Hadlow Grange. The attractive Lady Chapel was designed for private prayer and meditation.
An electronic organ was installed in 1993.

Listed buildings and structures are officially designated as being of special architectural, historical or cultural significance. There are over half a million listed structures in the United Kingdom, covered by around 375,000 listings.
Listed status is more commonly associated with buildings or groups of buildings, however it can cover many other structures, including bridges, headstones, steps, ponds, monuments, walls, phone boxes, wrecks, parks, and heritage sites, and in more recent times a road crossing (Abbey Road) and graffiti art (Banksy 'Spy-booth') have been included.

In England and Wales there are three main listing designations;
Grade I (2.5%) - exceptional interest, sometimes considered to be internationally important.
Grade II* (5.5%) - particularly important buildings of more than special interest.
Grade II (92%) - nationally important and of special interest.

There are also locally listed structures (at the discretion of local authorities) using A, B and C designations.

In Scotland three classifications are also used but the criteria are different. There are around 47,500 Listed buildings.
Category A (8%)- generally equivalent to Grade I and II* in England and Wales
Category B (51%)- this appears generally to cover the ground of Grade II, recognising national importance.
Category C (41%)- buildings of local importance, probably with some overlap with English Grade II.

In Northern Ireland the criteria are similar to Scotland, but the classifications are:
Grade A (2.3%)
Grade B+ (4.7%)
Grade B (93%)

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