No, no and no. A seagull crapping on the wall would be more interesting than the reality - it's just a reflection from an edge of rock. The apparently peeling roof is a very significant clue.
Hm - at top left that looks suspiciously like a porcellanous bed. So I'm going to opt for Scoska Cave, looking downstream, at the junction with Historic Way.
That's exactly correct Pitlamp - wife gazing longingly towards the entrance. I was thinking of taking her to have a look at the final choke but suspected that she might not enjoy it. I certainly wouldn't. Incidentally it was a hot day and the cave had a spectacular draught which could be felt well down the approach gulley.
Although my posts per day is totally wrong, as I forgot to divide by 13 years - so almost 3 posts per day (I did think that sounded rather high, but there were periods when it was more than above figure!) The views however averages over 200...