Well, it turned out that my mole wasn't precisely nothing, but it wasn't particularly anything either. It showed 'moderate cytological and architectural atypia', and was a 'dysplastic compound nevus', which all appears to mean that whilst it certainly wasn't a melanoma, given my family history of melanoma, it might one day have considered turning into one.

The long and the short of it is that I have to go back next week and have another 2 - 5mm removed from where the mole was, just to make sure nothing dodgy's been left behind. It's a shame - the wound had healed really nicely. But I don't mind. Better safe than sorry.