This small 'windmill' was almost certainly a wind pump used to drain the former clay pits which are now fishing lakes. The clay would have been used for brick making for the local building industry, which is where Brickyard Farm gets its name. The pump is only about fifty metres east of Wood Lane and not where there is a windmill shown on the O/S maps.
Not located where there is a 'windmill' marked on O/S maps, but only some 50 metres from Wood Lane on the corner of the fishing pond. Was there another one? Has it been moved? Or did the mapmakers just get it wrong?