Ignore me, I was talking rubbish
Try here instead http://www.gridreferencefinder.com/#
Actually, you were right before the edit. I was omitting the two letter map code, which for some reason the guide does not mention (actually, it never even mentions what maps you need).
Oh really? ah, sorry I editted then, and glad you saw it
@Jon. started
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Ignore me, I was talking rubbish
Try here instead http://www.gridreferencefinder.com/#