Apparently there's been a more-or-less silent change in the UK with respect to GMail.
It used to be that all UK GMail users had e-mail addresses in the googlemail.com domain. Apparently Google settled with whomever was keeping them from using the name 'GMail' in the UK, and now you're like the rest of the world, and have an e-mail address of the form yourn...@gmail.com The yourn...@googlemail.com address still works for the world at large, but if you send an e-mail from gmail to that address, the FROM address is now yourn...@gmail.com, and your e-mail would be bounced. I've unsubbed all of your yourn...@googlemail.com addresses and subscribed you as yourn...@gmail.com, Anyone who runs into problems with this drop me a line and I'll try to sort you out.