It's not legal in the U.K. It was downgraded a while ago in our classification system, but they are planning to restore it's previous classification in 2009.

From the U.K. Home Office website:

"The proposed changes would mean that - once the drug is reclassified - those caught with cannabis could still get a cannabis warning on a first offence, but on a second offence they are likely face a fine of £80. If caught a third time they could be arrested."

"The maximum penalty was reduced from five years to two years imprisonment in 2004, but it will return to five years if Parliament approves the reclassification to Class B."

I don't even think it's completely legal in Amsterdam. They just don't enforce anything.