It's interesting to compare the view of
Mapledurham watermill that appeared in the 1976 film
The Eagle Has Landed
(shown last night on ITV), with its current appearance as seen recently
in
Midsomer Murders.
In 1976, Mapledurham did not have its main waterwheel in place, so the
filmmakers actually built a whole new mill immediately downstream of the
real one. This ensured they had a rotating waterwheel which features
quite significantly in the plot. Of course having a fake mill in place
also helped considerably when the gun battle ensues, since it receives
considerable damage. (The filmmakers similarly had to build a replica of
the church, since that comes off much the worse for its battle scars).