I was at Shoreham Port that morning and remember seeing a large ship out near the windfarm with a cloud of yellow/brown smoke over it. It was quite unusual. The smoke was sort of rising up and leveling out over the ship to make a small “cloud”. I’ve not seen anything like that before and we’re used to seeing ships out there. (i’ve emailed the coastguard/investigation people about this btw)
It was also a very calm and hot day, the wind turbine at the point was still, or occasionally rotating slowly.
I also googled ship emissions, and it seems they are a lot less strict (even in controlled emission zones like the English Channel) so they produce a lot of Nox and sulphur dioxide, which can apparently react in sunlight and irritate eyes/nose. Smells like burnt matches apparently.
So my money is on ship emissions. Maybe they even burnt the wrong dirtier fuel when in the low emission zone?