Re: Etiquette for visiting foreign dojo
As Bruce will have been training for a year, the hakama/belt colour issue is not of interest.
I'd say that if you just came to class and said Hi, I am from dojo this'n'that in the UK, can I join class? it will most probablly work out well. Like Erik says, no need to make a big fuss about it. I would send an email in advance though. If nothing else you'd like to make sure that the place is not closed for some reason, plus you are more likely to be given some attention.