"This reminded me of the old joke. Whilst doing a crossword puzzle I got stuck. The clue was Post Box. I asked the wife and she said how many letters. I said possibly hundreds".
At the start coordinates you will find the oldest post box in England, it was commisioned by Anthony Trollope in 1853. It is an unusual octagonal shape with a vertical aperture. It has been recently refurbished by the Royal Mail.
on the time plate there is times for the last collections, take the hour of Monday to Friday as A and Saturday as B. The following formula will assist you in calculating the coordinates of the final location;
N 50 54. ((A-B)-1)B (A-1) W 002 26.(A-B)(B-1)((A-B)-1))
j
Check Sum for coded coordinates = 25