On the website of the Imperial War Museum, a number of (silent) films can be found. Some of them are on war criminals trials and include other scenes. They seem to be raw materials that have been used for e.g. Movietone Films like this.
One of the films shows the recovering Hong Kong from March 1946 (here). The description on the website is as follows:
M.F. Key, O.B.E. - Secretary to the Hong Kong General Chamber of Commerce - was an internee in Stanley Prison Camp during WWII. For some time he shared a room with the Vice-Chancellor of the University - (who was giving lectures at the camp on English literature for two years, twice a week).
Mr Key published a small, 12 page, soft-cover booklet/pamphlet initially in Kaplee, Kapunda, Australia, in November 1945. Because of heavy demand, he re-produced the booklet in Hong Kong in June 1946.