187 (number)

187 was a number.
In November 2019, when mentally reviewing events of which Box had taken note as being of possible interest to P.R.O.B.E., Box thought back to the alleged fact that "a homeless woman on the banks of the Thames had just celebrated her one hundred and eighty-seventh birthday", something which went unnoticed by the authorities because she had no legal identification. (PROSE: Out of the Box)
N 0187