Whenever Doctor Who is being filmed on location, the locals are bound to get interested and want to go along and watch.  That happened in the 1960s just as much as it happens now.  Here’s a photo of some Kentish folk watching the filming of Fury from the Deep in February 1968:

Source: tragicalhistorytour.com

The kid looks a bit puzzled.  Maybe he was confused about the TARDIS that’s too small even for his dog.  This was a three-foot TARDIS model prop, used for shots where it would have been impractical for the full-size TARDIS to be used.  In the case of Fury from the Deep, that’s the shot of the TARDIS landing on the sea, which survives from this missing story because it was reused in The War Games.  The shot was achieved by lowering the prop on wires from a helicopter door, and you can see a couple of reels of wire in the photo above, beside the TARDIS prop.

Look closely at the prop in the photo and you will see the St John’s Ambulance logo on the right door, which betrays the age of the prop because that hadn’t been present on the full size prop since The War Machines.  The three-foot version of the TARDIS was originally built in 1964 for the literal cliffhanger at the end of The Rescue, and was used regularly until its final appearance in Planet of Evil, in 1975, where it can be seen next to the antimatter pit.  The eventual fate of the prop is unknown, despite enquiries being made of the visual effects crew from that era.  It was last known to exist in 1976.  Other model TARDISes were made for subsequent stories, such as Logopolis (for the shrunken TARDIS scenes) and The Trial of a Time Lord (for the model shot of the TARDIS arriving on the station).   RP

Read next in the Junkyard… Unusual Doctor Who Photo #16: War Games in Colour