Appreciate this is a long shot - but the Scottish surf scene is pretty small so just maybe someone knows them.
Details below. (sounds like the camera is broken but the SD card still works)
Just spent a week with the family in the NW in the Stoer/Lochinver area. On Thursday we had a walk on Achnahaird Bay ( NC 015 140) just down the coast from Lochinver near Achiltibuie. Seems to be a popular surfing beach, there were a couple of surf vans there when we arrived, on a day when the fresh water on the beach was freezing at the margins. While we were bumbling about the rocks, I found a GoPro camera and housing.
It had obviously been in the water a while, totally waterlogged, lens scratched up, everything corroded. Even so, I reckoned the SD card might survive so I took it back to the cottage and retrieved the SD card. It needed splitting, rinsing, the contacts cleaning and then reassembled, but now I'm home its working just fine. No date stamps on the pictures or videos unfortunately, so no idea of when it was lost. I'd guess in the last few weeks.
Disappointingly the final video sequence does not show some massive wave ripping the GoPro from its moorings, or a Great White appearing behind the surfer. There's about an hours video and a few snapshots.
So, do you have a presence on any Scottish surfing forums? If I were to send you some frame grabs from the videos you could post them, and see if anyone knows the surfers. Someone might be interested to know what happened to their expensive Go Pro. Or maybe you know these chaps.