OK, it's not weird but it's definitely out of the ordinary.
When the opportunity presents itself, I'll sit out in the sunshine. I'm interested in almost anything that flies, be it bird or aircraft, so I usually have binoculars to hand.
I spotted this mighty beast heading northwards and had absolutely no idea what it was.
Wikipedia tells us that it is the only example ever built and was intended to transport the Soviet version of the Space Shuttle.
According to various websites, it has visited East Midlands on a number of previous occasions. My first thoughts were that it would be collecting aero engines from the Rolls Royce plant at Derby but it seems that Cargolux normally does that job with a regular flight to the Boeing plant near Seattle. No doubt all will be revealed soon.
I wonder how long it took for the brakes to cool down.
ETA: Intelligence reaching me says that it was collecting Rolls-Royce engines for the Airbus plant at Toulouse. Well, I was half right.