Quick point about the original article / posting:
Cannabis is not legal in the UK - its not even been de-criminalised.
About 3 years ago, it was reclassified from a class-B to a class-C controlled substance. What this effectively means is that if you get caught with a relatively small amount, you are unlikely to be charged with an offense. You may receive a Police Caution - a kind of official warning as to your future conduct that goes on your record (and may - for example - preclude entry to the US under the visa-waiver program).
Dealing will still land you a fairly lengthy spell as a guest of Her Majesty.
Point is - regardless of what you may or may not be able to do in Denver, DO NOT try blowing smoke from a doobie in a London copper's face or you'll quickly find out how they compensate for their lack of firearms.
