The banks in the UK often close people's accounts for being involved in Bitcoin. If the UK plans to become the global bitcoin hub its banks will have to change their attitude to bitcoiners. Most countries banks are hostile to Bitcoin, some are more hostile than the UK banks, but almost none of them seem friendly.
I think the banks are quite civil really. First they will ask, "what the devil are these transactions old chap?", and then when you tell them they will wait a week or two and write to you saying that they are closing your bank account, they arent legally obliged to provide a reason and they wont be doing so and their decision is final. They dont call you a bell end or anything mean like that.