First and foremost - this cache is not in the airport, nor is it near the airport boundary or on airport property. Do not search at the published coordinates.
Welcome to Stansted airport. This cache is aimed at locals, holiday-makers and tourists. It is an easy mystery that involves a small amount of online research. The cache is about 1km from the airport and can be easily reached by car, but not by bus or by foot from the airport. There is a stopping place at GZ, and the container is large enough for trackable items.
The cache can be found at North 51° 52.AB East 000° 15.CDE
The station opened in 19XY. X - Y = A
The brach was constructed at a cost of £B million
The length of Stansted airport runway is Z,E49 metres. Zx2 = C
The length of Stansted airport runway is W,003 feet. W÷2 = D
You can check your answers for this puzzle on GeoChecker.com.