It had been foggy over quite a few days before this. In the early hours of 18th December, it was particularly dense and persistent. For some reason the birds were singing like it was daytime.
This was recorded from The Shrubbery in Southend, that’s the cliffs below Royal Terrace and above The Western Esplanade. It was the same along the cliffs at Leigh as well.
You can see how foggy it was from the photo. You can hear the birds, but you don’t hear any fog horns. The pier is no distance away, and you don’t even hear the warble from there, ships were at anchor and underway and nothing from them, so I assume with radar these days ships’ fog horns in this part of Essex are almost a lost Essex sound. There seems to be no rhyme or reason with the one on the pier.