if you don't know how to change a tub (as I expect most of us on here do not), you don't want to even think about riding on one around London.
Useful bookmark for you.
How to change and fit tubs http://cnl.salk.edu/~jorge/xfer/TubularTiresAdhesivesandPracticePart1-4.pdf
I rolled one off when I was a kid cornering and ended up in a hedge :)
@Fixedwheelnut started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Useful bookmark for you.
How to change and fit tubs
http://cnl.salk.edu/~jorge/xfer/TubularTiresAdhesivesandPracticePart1-4.pdf
I rolled one off when I was a kid cornering and ended up in a hedge :)