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Did have brackets, now don't have brackets. Still no luck...
Disappointing. It worked for me for a test location, but on further testing it seems to rely on specific places having been linked to a grid reference in google's database, rather than google programmatically converting OS grid references to lat and long. Seems like such a basic function that it's surprising to find google falling down on the job like that.
Did you leave the brackets in your query string? You're not supposed to, they're just there in my post to denote regexp