Also worth noting that the section to Willesden Green has modernised signalling, implying that the film may date from 1911, [information sourced from the Jackson book on the Metropolitan and the District Dave web pages]. It's definitely before the building of the fast lines, opened in 1914.
In the middle parts of the film, the approach to Ruislip, a sequence starting from the Ickenham footpath crossing, and the approach to Uxbridge, are all included. Construction detail of the brick overbridges north of Rickmansworth is interesting, too. Agree it would be useful to see some of Rickmansworth and its detail - particularly the Up Home signal!
Station names on bridges and portals were probably canvas banners put up for the filming [source - debate on District Dave web pages].
Supporting post 444, the single motor coaches were created at a very important phase in the development of the railway, the same time as the Metropolitan were creating the 1910 batch of 'Main Line Stock' [colloquial name Dreadnought]. The motor coaches subtly mimiced the body features, the good looks and particularly the comfort of that family of vehicles. I know they make great models. As this film shows the single motors were useful spares and plentiful cushy seats for forming trains on the main routes as well as running singly, on Harrow to Uxbridge, Addison Road, Rickmansworth - Watford and Wembley Park - Stanmore services during their lives. Not 100% clear but it looks like 1905 Third and First Driving Trailer following the 1910 Motor Coach.
The film shows us a variety of Saloon Stock, and by this time probably gate ends had been reconstructed to sliding handworked doors. This enabled a reduction in traincrew and my grandfather, originally a Conductor, had to change jobs as a result and eventually became a Shunter at Aldgate. Earlier in the film, at Baker Street, the three-car train looks like 1905 build First Driving Trailer, 1904 Third Trailer, and 1905 Third Motor Car closest to the camera. The Third trailer here has the same body form as the vehicle in the LT Museum.