If you are a small or medium there are still some jerseys left here: http://shop.lfgss.com/
Otherwise you'll need to buy them 2nd hand or go back in time.
@Khornight2 started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
If you are a small or medium there are still some jerseys left here:
http://shop.lfgss.com/
Otherwise you'll need to buy them 2nd hand or go back in time.