OP, your second post does , luckily, say more about your concerns...and I think, I can understand why you hvae them, but as it has mentioned already, I don't think you need to be concerned...if that amkes sense...
I must admit, I find the people in Britain can have a real problem about accepting other languages, dispite it being such a diverse and multicultural...
Used to go to a Mums and Tots group ( run by fellow army wifes)...and there was another german girl there, so, sometimes we would converse in german, but not to bitch, just, when we were talking just to eachother, but not in a way to exclude...it wasn't that we weren't talking to any of the other mums or anything and are unwilling to speak english, etc...
so, I must say, when the girls, that led the group, suggested that we may NOT talk in german, as the otehrs felt excluded and yaddayaddayadda....I was furious...I actually did complain about this,I thought it was just utterly ridiculous .....