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Commander Cache,
A nationally sensitive situation has occurred in the One Tree Hill Country Park. A UK top secret prototype fighter aircraft has crash landed. The black box from the aircraft contains information which would be extremely detrimental to national security should it fall into enemy hands.
Just prior to the pilot bailing out of his fighter aircraft, he jettisoned an emergency transponder (type - Squirming Twurp). Your first task is to receive the signal from it using a compatible Grounded Plane Systems (GPS) locator and plot the position of the black box.
Make your way to the posted location and then proceed along the bridleway in an easterly direction. It should not be long before you receive the transponders signal. If you have reached the location for the capsule, you have passed the transponder location.
Please do not waste time here locating the transponder as it is not required to complete the mission and is completely useless to you as it has been locked to another GPS.
Once you have the location you may switch off your twurp searching feature to conserve battery power.
It has now come to our attention that a capsule has been hidden close to the transponder with the coordinates for the black box written on it. The location for this capsule has been added as an additional waypoint. Should you fail to receive a transponder signal, you can locate the capsule for the location of the black box
Your next task is to reach the location. Once there you are looking for something that resembles a 1.3 Litre clip top box covered in gaffer tape (that's because it is a 1.3 Litre clip top box covered in gaffer tape, the MOD had to make some cut backs during the fighter's development).
Please be aware of all unidentified personnel in the location as the enemy will be hastily closing in on your location and therefore extreme stealth and caution should be exercised to prevent the black box or yourself falling into enemy hands.
Should you fail to return from this sensitive mission, your government will deny all knowledge of your actions and your caching equipment will be sold on a popular auction web site (other auction web sites are also available).
Good luck Commander, and Gods speed.