http://www.ebay.co.uk/itm/NECO-Bike-Cycle-Threaded-Headset-1-1-8-Black-silver-standard-oversize-/251366275124?pt=UK_sportsleisure_cycling_bikeparts_SR&var=&hash=item3a8698f834 £4.99 and it's freepost as well.
@dkmike 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.
http://www.ebay.co.uk/itm/NECO-Bike-Cycle-Threaded-Headset-1-1-8-Black-silver-standard-oversize-/251366275124?pt=UK_sportsleisure_cycling_bikeparts_SR&var=&hash=item3a8698f834
£4.99 and it's freepost as well.