CR06-Miss Leeds. Geolympix Cyclerama II:06 Multi-cache

Set with help from The National Trust along the Chilterns Cycle and Icknield Ways through the Ashridge Estate, running north/south between parking for Ivinghoe Beacon and passing Aldbury in Bucks, this series of caches, mostly along surfaced paths, are a part of the 2016 Geolympix Legacy.

Gather a letter and a number from this cache to find the Terry Bull-Punnz SERIES BONUS cache.

To find this cache: Start at the above co-ords, where you'll find something unusual. In the format DD/MM this date becomes AB/CD. Now head to:
N51° 49.((((((((A+C)x(CxD))x(B-D))xB)+D)xA)+B)xA)

W000° 35.(((((BxB)x(B-A))+C)xA)xB)

for the cache itself. This is best done when heading south, towards Ashridge's cafe, shop etc. Perhaps with a pen and paper? You'll need to leave the track by several metres/yards. Good luck!