A tripoint is a geographical location where the borders of three regions meet. The above dummy co-ordinates are at the Hampshire-Surrey-Berkshire tripoint. There is nothing hidden there of course, you will have to solve a puzzle for that.
I have taken six photos each from one county across the border to another. Its your job to identify those places. Go to each one and gather some numbers.
1) Berkshire to Surrey
You should be standing on something metal here:
A = the number of times the number 6 appears
2) Berkshire to Hampshire
Of the letters carved on the wooden structure beside you:
B = Number of vowels
C = Number of consonants
3) Surrey to Berkshire
High up on the right hand post:
Phone number = 020 xxxD Exxx
4) Surrey to Hampshire
On the back of the thing to your right
F = Number of times the word "pass" appears
5) Hampshire to Berkshire
On the thing to your left:
GH = Number of letters between "www." and ".co.uk"
6) Hampshire to Surrey
On the water level depth gauge:
JKLM = The four digit number at the top just out of shot
You will find the cache at:
N51 (A/J)K.B(F+G)L
W000 46.(D-C)EH