Ellesmere is a market town in north Shropshire, notable for its proximity to a number of prominent meres which has led to the area being known as Shropshire's Lake District.
This is a bonus cache placed alongside the nearby lab caches, with the information gained by first logging each of the five lab caches. Once all five have been logged and completed, you will then have the information needed to find the final location.
This bonus cache can be found at N52 54.ABC W002 53.DEC The posted co-ordinates will not take you to the cache but instead to a handy car park from where you can begin your adventure. There may be on road parking nearer to the start if it isn't busy, but that is also pay and display.