The co-ordinance above are not where the bonus is, that is the co-ordinance of where the Public right of way starts., where you can walk back to the Highgate lane. There is also a small area where you can park a car if needed. You will need all the numbers on all the caches to work out where the bonus is.
Having collected all the red coloured numbers, please follow the calculations explained in the description on the first cache. When you have the answer you will be looking for a small container in a bag. I have also placed a TB in it, would you please move it on. Return the cache to where you find it. Thanks I hope you have enjoyed this series of caches.