The Location

In Thames Barrier Park . Whilst no Visitors' Centre on this side there is a pleasant Café. The Park is nice, there is a kids play ground here with some interesting equipment. There is good public transport straight to the site (buses and DLR Pontoon Dock).

Unfortunately the water feature near the entrance is presently out of order as a result of vandalism.

The gardens are neat and well maintained.

Opening Time:[
Open daily (including holidays) 0700hrs

Closing Time (seasonal):
January 1645hrs
February 1730hrs
March 1830hrs (BST 1930hrs)
April 2000hrs
May 2045hrs
June 2115hrs
July 2100hrs
August 2030hrs
September 1915hrs
October 1815hrs (GMT 1745hrs)
November 1645hrs
December 1630hrs

There is another cache in the Park so you’ve got two good reasons to come here as well as to enjoy splendid views of the river and the barrier elements themselves as well as a cache.

The cache

I was impressed at the shapes of the hedges in the formal garden, so some more shapes will help you find the cache seem appropriate.

A bit of googling will help you with this, so if you’re not online in the field, some advance work is necessary.

You can check your answers for this puzzle on Geochecker.com.

The cache is located at N 51 30.X E 000 01.Y

Where

X is given by the result of: An Enneacontagon  + an Enneakaidecagon – an Enneagon – a Triskaidecagon + an Icosagon – a Tetragon – a Heptagon

Y is given by the result of: A Chiliagon – a Tetracontagon + a Pentakaidecagon – a Heptagon  - a Hendecagon + a Tetragon