Possibly not the micro you expected. But according to Raymond Bowers, in his book 'In Search of England's Smallest Church' you have found one.
He stated "By his reckoning this is England's smallest Parish Church just marginally bettering Culbone's claim". (Unless you know different?)
The church is now maintained by 'The Churches Conservation Trust' and is always open.
Now in true caching fashion you will have to answer a few questions here to lead you to your goal.
Number of small opening windows = A
Number of sides to font = B
Number of recesses on inside of door = CD
Number of nails holding the surround of the exterior door handle = E
Number of bolts holding upper door hinge (Be careful). = F
Date above door = GHIJ
Number of pillars at bell tower = K
How many Gargoyles does the bell rope pass through = L
Now off to N50 51.(F+A)(G+J)K W002 34.(E+L)DC to find a 400ml screwtop beaker a couple of hundred yards away. Couple of boggy spots on way.
Checksum of all co-ordinates = 48
NB. Don't go through the obvious gate (Private) but follow o/head cables to stile and f/path.