I'd certainly take the opportunity to carry one if it was legal in the UK, I had a UK FAC for five years and with the appropriate training do not see a problem:we have a general issue with guns in the UK, they are not the devil in disguise just tools to be treated with the upmost care.
Personally I'd want something with a little more va va voom like an MP5K....Ooh better stop I'm scaring myself now