Looking at the geocaching map, there's a distinct lack of caches in one area, centered around Burgess Park.
Why? It's not the middle of nowhere! Instead, it's the beautiful Burgess Park, with its many amenities and interesting history. It's one of the biggest parks in London! The friends of Burgess Park have created a history trail with information plaques, called 'Bridge to Nowhere', which you can learn more about here: http://www.bridgetonowhere.friendsofburgesspark.org.uk
This cache makes use of three of the sites the trail highlights. You need to find six numbers (a, b, c and x, y, z) which will then let you find the final.
The Grand Surrey Canal used to run along the length of Burgess Park. Coal and limestone brought along the canal was burnt in the lime kiln at Stage 1 to make quicklime, which was then transported off again along the canal.
a - Add the first two numbers of the year the kiln was built/founded
b - Add 3 to the lime kiln's grade (google is your friend...)
c - Subtract 7 from the number of years it took to build the canal.
Walk from the west to the east side of the park using the tunnel, which also reminds us of the canal that used to be here and the barges that travelled along it.
Stage 2: N 51° 28.926' W 000° 05.134'
x - Number of green bottles in the boat
As you walk towards the next stage, make sure to take notice of the 'Camberwell Beauty'! It used to be the trademark of local stationers Samuel Jones & Co and was moved here when their factory was demolished in 1982.
The building at Stage 3 contained a library, public baths and wash house. There were two larger communal baths and 50 bathtubs - the cheapest option was to take a cold bath for the equivalent of 30p!
Stage 3: N 51° 28.943' W 0° 5.137'
y - The foundation stone was laid on this day in 1901, add the two numbers
z - It was opened in 190? Multiply the last number by 2.
The final is a short walk away, at N 51° 28.abc W 000° 04.xyz
I hope you've enjoyed the park and learning some of its history. It's always hard to find a roomy box in London to pass on travelbugs with slightly larger attachments. Hopefully this one will prove useful!