This is the bonus cache for Henley's Hotspots Adventure Lab. Henley has so much to offer that 5 Adventure Lab locations did not feel quite enough, so there is a waypoint as the starting point of this bonus before moving through the 5 Adventure Lab zones. Whilst there are multiple car parks and parking options in Henley we have added just two as waypoints - one in the town centre which we believe is the most convenient for the start/end of the Adventure Lab and a long stay car park slightly to the north of the town centre. Both are convenient for picking up appropriate TOTTs to complete this bonus a short distance out of the town centre, please see hints/attributes.
The Adventure Lab taken at a leisurely pace should take 45 minutes to complete from the Town Hall to the last location (all Adventure Lab locations are listed as waypoints for your reference. To complete the bonus will potentially add an extra hour dependent on retrieval skills.
At the headline co-ordinates you should be outside the Town Hall by the market square. This is a grand Victorian building that was erected to commemorate Queen Victoria's Jubilee in 1902. The market place has been in use since the 13th century though the current market has been in situ since 2000. For the first stage of the bonus (1) please look for the engraved brick laid by the Rt Honorable Earl of Jersey. Take the word after "Oxfordshire" (10 letters). Then secondly take the day and month in 1899 noted on foundation stone laid by William Danvers in DDMM format.
On completion of the Adventure Lab the journal will provide the last 2 bonus letters and a phrase. Please concatanate what you have from the Town Hall and from the Adventure Lab into a single string, separated by a hypen and enter that phrase into certitude. That will give you the information needed to move to the next stage of this cache a short distance out of the town centre. That intermediate stage will give you instructions for determining the coordinates of the final cache and log-sheet; and those coordinates can be confirmed by using the geocaching checker on the page.
An example for certitude:
If the information from the town hall were "geocaching" and "0205" and the information from the adventure lab was "laboratory" entering "geocaching0205-laboratory" into certitude would yield the required information.
You can validate your puzzle solution with certitude.