Hemswell's runways have been 'recycled' now but you can access directly from the main road and drive around the peri-track. Wg. Cmdr. Cozen's film shows Lanc's taxying past the watch tower and the same view can be had from this entry road which was the old runway threshold. He (or the cameraman) must have been standing near the signaller and others who always waved the crews off.
I used to fly into Hemswell in the 70's and 'Supply Command' was painted on one of the hangars, we could have a cuppa and and a chat in the watch tower which was used as a club house.
Link here
http://www.oldairfields.fotopic.net/c206144.html