My travel insurance won't cover my lovely new bike against nicking unless it has an electronic tag. Does anyone know if these things will fit into any seat post? Or should I get one of the wee glue-in bobbins? http://www.halfords.com/cycling/tools-maintenance/bike-storage-solutions/immobitag-electronic-cycle-protection#tab3
(I'm a bit miffed with them as it seems to me the chances of the police in another country checking a UK database if they DID recover a stolen bike are quite low!)