We managed to jam a Camalot C4 Size 3 at the top of Pigeon Hole Crack,
Pigeon Hole Crack (S 4a) Holyhead Mountain over the weekend. You can see it from the belay stance if you look into the crack at your feet. Rather than see a nice piece of kit go to waste as anyone coming across it won't know it's origin, I suggest someone local grabs it. We tried for about 15 mins with a nut key but I'm sure it's freeable. Check it on retrieval in case we bashed it up too much. It's 3 years old, so plenty of life left in it I imagine.
Cheers,
Chris