Ovaltine was very popular in Britain, and was manufactured at Kings Langley in Hertfordshire using a process that included GEA Wiegand falling film evaporators to concentrate liquid malt extract which was then dried under vacuum in steam heated band dryers. The art deco style Ovaltine factory in Kings Langley is a well-known local landmark. Production ceased in 2002 and the factory has now been redeveloped as luxury flats. Near the factory was a health farm run by the Ovaltine works which was set up as a model farm and a health resort for disadvantaged children, which operated until the 1960s. Later, the farm land was sold and is now largely occupied by the M25 motorway. The Ovaltine Egg Farm is now the site of Renewable Energy Systems Ltd. and the site of the first wind turbine visible from the M25.