Allow me to introduce you to the oldest report that didn't receive any reply in our entire Bugzilla. It's related with maps:
Bug 2340 - Support for OS grid refs for maps of UK and Ireland https://bugzilla.wikimedia.org/show_bug.cgi?id=2340
I have no idea about the topic itself, but maybe someone in this list can follow up there, and remove such honor from that report. :)