The cache is not at the published coordinates however should you need an additional hint as to the puzzle’s theme, try standing there at exactly 6 p.m. and listen 
The puzzle requires you to visit a set of six similar buildings within the boundaries of, or close to, the city of London. To keep things interesting you will not be told what or where the buildings are!
Once at the location there will be a question to answer. To encourage couch cachers to get some exercise and explore the streets of London I’ve tried to ensure that the answers cannot be easily found online – you will need to visit the buildings.
Please note:
a)
There is some disagreement over the correct identity for building 1. There are two possible candidates - assume the one closest to the published coordinates
b)
There is also some disagreement over the correct identity for building 2. There are two possible candidates - assume the one that no longer exists, but has a square blue plaque commemorating where it was. Stand in front of the blue plaque and then answer the question.
A trip to all the required locations is a walk of approx. 9 km.
When planning your route I suggest that you arrange to arrive at building 1 last. This may save you a further long walk to the final cache location.
Arrange the six buildings in the customary sequence and answer the following questions:
The questions assume that you are standing immediately outside the main entrance of each building, looking towards it.
1.
By your right foot is a circular plaque. How many aeroplanes are on it? Answer = A
2.
Near your right foot is an item owned by Thames Water. The text on it starts with two letters followed by a four digit number. The number is 58B4 i.e. Answer B = the third digit of the number.
3.
Inside the porch and to your left is a coloured window in memory of Anne; wife of Matthew. Anne died in the year 18C1 i.e. Answer C = the third digit of the year.
4.
Above your head is a clock. How many stone segments form the frame of the clock? Answer = D
5.
Each door ahead of you is held in place by a curved hinge at head height. How many nails are in each of these hinges which attach them to the door? (Include all nails, regardless of the shape of their heads). Answer = E
6.
How many panes of clear glass are in the lamp above your head? Answer = F
The cache can be found at N 51° 30.DBC W 000° 06.(E+1)A(F+2)
You are looking for a customised container in keeping with the theme of the puzzle. Tweezers might be helpful. Please roll the log tightly and leave the cache as you found it.
Please do not leave comments or photos in your logs which give away the subject of the puzzle.
This cache was partially inspired by the excellent Ale Trail by RichieCactus which had me traipsing for enjoyable miles around London but hopefully the maths with this one is less arduous!
Congratulations to vladikavkaz on the FTF
