Was just watching through binoculars a Voyager at 13000 passing south of me, I assume Brize-bound,.
My attention was caught a couple of minutes later to a VERY red high-flyer trailing towards Reading.
Checked FR24, it's a Play A320 to Mallorca, but it was SO red, I thought at first it was reflecting the setting sun.
I don't think I've ever seen such a totally all over deep red airplane before.