Although I’m still pissed off with the British for voting in favor of Brexit, I have in the meantime forgiven them to a certain extent. So if somebody with a British accent addresses me in the street, I am somewhat willing to give them an answer in English. Scots I will always help, naturally, them dressed in wee skirts and with their quaint musical instruments. As to how the British should react to visiting Yanks; just answer in your local dialect, nobody can understand that. Be warned, though, some yanks put Canadian flags on their backpacks and clothing. In case of uncertainty, ask them from which Canadian province they come (yankees will not know what a “province” is), or speak French with them.