I can confirm there was a particularly load aircraft around sometime between 12 an 2pm yesterday. No idea of exact time.
I was pruning trees in my garden about 4 miles from Croydon. I'm used to aircraft noise but one was so load that I climbed down the ladder to look.
Couldn't see anything. Lots of huge fluffy clouds to the North and heavy black rain clouds to the West - very breezy too.