This painting is framed and on the back is written Brill?. I felt this was unlikely to be Brill in Buckinghamshire as the trestle mill there was destroyed in 1906. This painting series and style is from the late 1930s. The surviving mill in Brill is not a trestle mill.
However, Gareth Hughes and Adam Marriott advise that, at the time of this painting, the round house was missing, exposing the trestle.
It is Brill – for a period from about 1910 until the 1950s the roundhouse of the existing mill was missing, exposing the trestle.
it could well be brill the round house was demolished in the early 20th century and only rebuilt after the war so Brill is probably correct