Hey runamuck,
It's been an indoor guitar its whole life, and treated very gently too, so I don't think there have been any shocks (none that I know of at least!).
Jon, thanks for the tip, definitely won't apply polish directly from now on.
As far as I recall, this line appeared after cleaning guitar, so I think it's somehow related to the polish (or maybe some interaction it had with the finish) but it doesn't seem to come out just through scraping (I've tried with a toothpick so far) so I thought maybe the polish had somehow reacted with the finish or something around heel - it definitely looks like there is finish joining the neck and body, almost like a small bead of caulk running along the joint, which I assumed was glue.
Thank you all for your help so far!
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