with their english colleagues who they interface with daily
Interface?
all the emails are in english as we are interfacing with the uk
Interfacing?!?
Please. Stop. That word cannot be used like that. Atall. Ever. Just for the record, though not specifically applying to the OP, a 'problem' is just that. It is not a challenge, it is a problem. If you say challenge, we know you mean problem, and we also know that you think that it is negative to call a problem a problem, so you instead choose 'challenge' instead os saying problem, which is what you really mean. You look like a fuckwit. Don't ever do that. Oh, and anyone ending an email with "kind regards" comes across as a twat by the way. Oh yeah man, also, anyone using a stupid font for their email signature, so that it looks like fucking joined up writing, or copperplate or some shit, well, they deserve to be beaten up by loads of big blokes with sticks and stuff.
the sister company that merged into ours have that DREADUL habit of walking round the building telling people they have sent them an e mail
I've PMed you about that.