About
Mill Green Museum and Mill occupies one of the most appealing sites in Hertfordshire: an 18th-century watermill on the banks of the River Lea at Mill Green, a hamlet on the edge of Hatfield, its millpond and millrace creating a tranquil enclave that feels entirely removed from the busy new town that surrounds it. The mill has been restored to full working order and regularly demonstrates the ancient craft of stoneground flour milling — converting locally sourced grain into wholemeal flour using the same traditional millstones and machinery that have been at the heart of rural food production for centuries.
The mill building itself is the museum's centrepiece and greatest asset. An 18th-century structure on a site with a much longer milling history — the Domesday Book records a mill at Hatfield — it has been meticulously restored to working condition by Welwyn Hatfield Borough Council following a period of dereliction. On milling demonstration days, visitors can watch the great waterwheel turn, feel the vibration of the millstones through the wooden floors, smell the warm grain dust, and purchase stoneground wholemeal flour produced on the premises. It is a multisensory experience that no static display of milling equipment could replicate.
The attached local history museum is no mere afterthought: it houses a significant collection covering the history of Welwyn Hatfield from prehistoric times to the present, with particular attention paid to two themes that define the area's modern identity. The first is the story of Hatfield as a planned New Town — one of the post-war developments created under the New Towns Act of 1946 to house London's overspill population, designed with idealistic intent to provide working-class families with green space, modern housing, and community facilities. The second is the extraordinary aviation heritage of the de Havilland Aircraft Company, whose works at Hatfield produced some of the most significant aircraft in British history: the Mosquito, the Comet (the world's first commercial jet airliner), the Trident, and many others.
Together, the working mill and the local history collections create an institution of genuine depth and range. The mill connects visitors to the deep agricultural past of the Hertfordshire countryside; the local history galleries document the dramatic transformation of that countryside in the 20th century. Admission is free, the flour is for sale, and the millpond garden is one of the most pleasant spots for a quiet hour in Hatfield.
Categories:
Highlights
The Working Watermill
The 18th-century watermill at the heart of the site has been restored to full working order — one of a relatively small number of working mills in England where the complete process of stoneground flour production, from grain to flour, can be observed in action. On milling demonstration days, the waterwheel drives the millstones through a sequence of shafts and gears that have been carefully maintained and restored, producing wholemeal flour sold in the mill shop.
The physical reality of industrial food production before mechanisation — the scale of the machinery, the noise, the smell of warm grain, the flour in the air — is viscerally impressive.
The Waterwheel and Millpond
The external waterwheel and millpond form one of the most picturesque industrial landscapes in Hertfordshire — a scene that has changed little in two centuries, the River Lea flowing through the millrace to power the wheel before rejoining the river below. The millpond is home to waterfowl and supports a rich riverside ecology, and the garden around it provides a tranquil space to sit and watch the wheel turn on milling days.
The engineering of the wheel — its timber construction, its iron fittings, its relationship to the water level — is explained in accessible interpretation panels.
de Havilland Aviation Heritage Displays
The local history galleries contain a substantial section on the de Havilland Aircraft Company, whose works at nearby Hatfield Aerodrome produced some of the most significant aircraft in British aviation history. The Mosquito — the legendary twin-engine World War Two bomber and fighter, built largely of wood — was designed and produced here.
The de Havilland Comet, the world's first commercial jet airliner, made its maiden flight from Hatfield in 1949.
The Trident, the world's first trijet airliner, followed. These displays celebrate an achievement of British engineering creativity that transformed global aviation.
Welwyn Hatfield New Town History
One of the most significant social planning stories of 20th-century Britain unfolded on the doorstep of this mill: the creation of Hatfield New Town under the New Towns Act of 1946, designed to provide London's overspill population with modern housing, green spaces, industry, and community facilities in a planned environment.
The museum's local history galleries explore this experiment in social idealism — its architects, its intentions, its achievements, and its contradictions — with maps, photographs, documents, and oral history recordings that give a human texture to what could otherwise be a story of planning policy.
Collections
The Mill Story: Eight Centuries of Milling at Mill Green
From the Domesday Book mill on this site to the restored 18th-century watermill that operates today — the history of milling at Mill Green told through the building, the machinery, and the craft of stoneground flour production.
Welwyn Hatfield: Ancient Landscape to New Town
The full sweep of human history in the Welwyn Hatfield area, from prehistoric settlement through Roman occupation, medieval agriculture, and Victorian industrialisation to the post-war creation of Hatfield New Town and the de Havilland aviation works.
Current Exhibitions
No current exhibitions. Please check the museum website for updates.