This is my Olly, there are many like it, but this one is mine
Many old film cameras can be picked up fairly cheaply on eBay these days, well at least they can if you stay away from with the name Leica!
The Olympus 35 RC is cheap, fast, and most of all compact. While not exactly shirt pocket size, its hardly bigger than todays point and shoot cameras and will easily fit into a coat pocket. Pair it with some nice film and away you go!
For more information on the Tetney Blow wells you can visit the Lincs trust website