The Daemons is a favourite story of mine partly because it shows off everything good about the Pertwee/UNIT era, partly because it was filmed in & around the village of Aldbourne, Wiltshire, which is just a few miles down the road from me now as I type.
Perhaps the most legendary thing about it is the viewer who genuinely believed that the production team really did blow up the church and wrote in to the RT/Points of View or phoned up the Duty Office to complain!