Simply Connectors 3 - Physical Mystery Cache

This cache is one of three in a series which I've hidden as a cheeky tribute to Jesmond Lynam's excellent Only Connect series.

There is a car park (free after 6pm) at the listed coords. To find the cache you'll need to solve this puzzle:

The cache is hidden at N54 57.X W001 36.Y where:
A = Robertson
B = Double slot
C = Torx
D = Hex
E = TA

And:
X = C x (B + E) x D + (D - A)
Y = (C + A) x B x D + (B - E)

You'll need to take a tool to open the container. It needs to be a proper tool that you bought from a hardware shop - you'll not be able fashion something from a stick in the field here! Maybe you should take an adjustable one...

You can check your answers for this puzzle on GeoChecker.com.