Thanks everyone for your responses, it's great to see such a helpful community.
We did indeed email them, and they said they'd change it, and then 7 weeks later, they are still using it, and still claiming finds with the account.
I appreciate that people have similar names, etc however in this instance, we're in the same city, using the same username, albeit with a underscore being the point of difference, and we created our account first...
Cheers
the_robots (the originals, at that ).