I didn't have to locate the manual release in the end at all.
Turned out to be yesterday before I could get to it, but all the driving must have shaken the offending item (a twig) loose enough for the tail gates to work properly.
Managed to pry it the twig with some needle nose pliers - it was stuck quite good, presumably squished by the weight of the tailgate. Who'd have thought such a little item would cause so much grief!
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