What that guy said!
Public perception of Bitcoin in the UK is not ideal. Until recently, most coverage has been of Amir selling Bitcoin as an anarchists wet dream. I think 75% of the population of the UK don't really care about that. In America, where they have a constitution to protect them from the government - I think selling on those ideals works a bit better.
Over here, a better approach for Bitcoin adoption I believe would be pointing out how you can save time and money by using Bitcoin and highlighting the benefits compared to existing systems such as PayPal.
The single most convincing argument for small retailers and pub owners should be that there is no change. If you've ever been in retail you know organizing the change is the biggest pain in the ass.