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Mission Impossible MK 6 : The Fishy Cache Mystery Cache

This cache has been archived.

Kitey: Time to be finally laid to rest. Thanks to all who found it - I hope you had as much fun solving it as I did setting it. Kitey

For those that never managed to solve it:
This is about the Royal Mail Fish Commemorative stamps published on 26th Jan 1983.
The person in the hint images is Sir Rowland Hill, although the big give away is the bright red post box in the foreground!!

Hidden : 05/03/2009
4 out of 5
2 out of 5

Size: Size:   small (small)

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Geocache Description:

A picture puzzle set somewhere in the environs of the City of Milton Keynes.

It will be possible to complete any cache in the series individually, but it will probably be much easier to solve them in order. A clue will be provided in each cache giving some help in solving the next one (or previous one) in the series. There will be a unique, personalised and exhilarating prize for the first Cacher to complete the Series.

All you have to do is establish a date connecting the pictures below :

Then extract some numbers from these fishy pictures :

Finally determine the co-ordinates from this formula :

N52 00 . [4 * (A + C + D)] W000 42. [(B * (A + C)) - D]

As it is a fishy cache there is water near the final cache location, so please take appropriate care with children and geodogs.

You can check your answers for this puzzle on

As usual, some clues to other caches in this series in and around Milton Keynes are available to finders of this cache:
1 - Mission Impossible MK 4 : It’s called a What? (GC1MBZV)
2 - Mission Impossible MK 7 : O Whose Workpad (GC204CC)

Additional Hints (Decrypt)

Chmmyr : Ner lbh fghpx? Creuncf gur punc va gur tnyyrel pna uryc .... Pnpur : Hc fybcr, arkg gb jnyy

Decryption Key


(letter above equals below, and vice versa)