Harmondsworth Moor - Halifax Memorial Multi-cache
Rainbow's End: Checked today and the cache has gone. We're going to archive it as, being a multi, it hasn't been as popular as our other caches on Harmondsworth Moor. It was only a multi because there was nowhere to place a cache close to the Halifax Memorial, which was why the cache existed in the first place.
Thanks to all who came to search, maybe we'll come up with a Halifax Mark II [:)]
Harmondsworth Moor - Halifax Memorial
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Difficulty:
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Terrain:
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Size: 
(small)
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The cache is not at the above co-ordinates. At these co-ordinates you will find a memorial with the information you need to find the cache.
Car parking is at N 51°29.303, W 000°29.170. The entrance to the car park has very high kerbs to prevent large vehicles entering.
Harmondsworth Moor is the largest public park to be created in the London area in the last 100 years. It is built on 240 acres of reclaimed land near Heathrow Airport between the M4, M25 and A4 and has a mix of undulating meadowland, winding footpaths, bridleways, lakes and rivers - the Colne, the Duke of Northumberland's River and the Wraysbury River.
Around 70,000 mainly native trees have been planted and ancient meadows created using specially harvested seed to establish flowers and grasses once common to the area. There is a wide variety of insects resident, such as butterflies, grasshoppers and bush crickets, and many species of bird are breeding here, including lapwing, skylark, kingfisher and sand martin.
Thank you to the Parkland Rangers for allowing us to place this cache.
In 1943 a Halifax bomber of the Royal Canadian Air Force returning from a mission in France, crashed on what is now the Moor, with the loss of all on board. Two young boys living in the village never forgot this, and more than fifty years later, in 1999, they were present when a plaque dedicated to the crew was unveiled and a maple tree planted at the spot. Since then each Remembrance Sunday a small group gathers for a simple ceremony.
The Memorial plaque is on a stone block that was once part of London's Waterlooo Bridge until its demolition in 1935 when the stones were moved here. More stones have been used to make follies nearby on the Moor - look out for The Keyhole and The Giant's Teeth.
The information you need to collect from the memorial is:
A The number of maple leaves on the plaque (ignore the one hidden behind a crest)
B The Bomber Group number, plus A
C The day of the month of the crash, divided by 2
D The number of Royal Air Force personnel in the crew
E The last digit of the aircraft's serial number, multiplied by 2
F The Flight Sergeant's surname begins with the F letter of the alphabet (e.g. if his name began with 'G', it would be 7)
The cache can be found at N 51°29.ABC, W 000°29.DEF
It is a small plastic box containing, amongst other stash, an unactivated First to Find geocoin as an FTF prize.
We hope you enjoy finding our first cache.
2 May 2009: Several people have made the same mistake in the calculation. We didn't intend there to be a trick question, so have added an extra hint.
Additional Hints
(Decrypt)
Gurer ner gjb zncyr yrnirf. Abg nyy gur perj jrer Eblny Nve Sbepr.