Big thanks to @peb205, who had wanted to convert Northings and Eastings data into latitude and longitude so that he could add locations to some of his pictures. It might be that one day we can support both sets of co-ordinates, but in the meantime, he's pointed us to this online converter at the OS, which you might find useful if you're in a similar position.
updated by @iamtimbo: 05 Jan 2016 11:26:31
updated by @iamtimbo: 05 Jan 2016 11:26:31