These signs appear all along the seafront at Blackpool: on sliproads and steps down to the beach. In summer they're taken down during low-tide, but at this time of year they tend to be left in place. Oh, and the title refers to the fact that I've put a couple of these up before: this one and this one.

On a totally unrelated matter: I wonder if anyone could tell me where I can get hold a B+W 113 neutral density filter with a 77mm thread. I've been trying to track down one of these in the UK since before Christmas, but with no luck – mostly because nobody seems to be importing them at the moment. So, if anyone does know of somewhere where I could pick one of these up (either in the UK or further afield) I'd be really grateful if you could let me know.

Thanks to a comment from cj I've now managed to order the filter from Germany.