*** Please note *** 11.02.19 - While out on a maintenance check we have seen that there is forest works taking place and therefore there are restrictions on access. We would advise that you check with the Forestry Commission before attempting to do this series. Unfortunately have not been given a finish date, will try and check periodically.
Please see Grime’s 1 for introduction to this series.
A natural object inside another natural object.
The description and the cache title should be sufficient for you to locate the cache but if all else fails the hint is a dead giveaway.