Passengers warned over 100ml rule change at UK airports

Two airports in the UK have become the latest to change the 100ml liquids limit. Edinburgh and Birmingham airports now allow passengers to keep all of their belongings, including liquids of up to two litres, in their bags when going through security. The restrictions were implemented in 2006 after a foiled terror plot to blow up planes flying from London to the US with homemade liquid bombs. Simon Calder explains everything you need to know about the change, including why travellers have been warned that rules for their return journey are likely to be different.