Its the toxic gas emergency siren from ICI Wilton (don't know what its called now). They used to test it weekly when I worked there in 1996. Dupont used to use it weekly as they accidentally released nasty looking gas into the atmosphere. It was followed by a very posh man announcing "This is a toxic gas emergency close all doors and windows" in the Wilton Research centre. I hated Middlesbrough the whole place just stinks of chemicals on a warm day.
(, Tue 28 Aug 2012, 6:40, Share, Reply)