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@Bad_Science
It bloody works!
Battery attached to my Maplin booster battery with its built in jump leads, positive to positive. Charger connected and immediately all the correct lights come on like a christmas tree.
It now has enough charge in it to get rid of the booster, and is on trickle charge all night as if nothing had happened.
Will be interesting to see if there is any lasting effect to the battery, but it seems that AGM batteries are much more forgiving of deep discharge.