Chateauroux is ominously known as a 'plane graveyard', where BA sent their A380s. I only know this because I'd watched loads of YouTube videos of airports around the world with runways and taxiways strewn with planes.

...came across this video of the Chateauroux airport: https://www.youtube.com/watch?v=yQD_Hxoj6XA

it's where veolia have their aircraft dismantling site , I read somewhere that veolia have 180,000 employees world wide !
if I remember correctly concorde crews used to be trained

By the looks of it a number of BA A380s have been moving back and forth between there and Heathrow. Maybe for maintenance work to keep them airworthy or to keep crew flying hours up?

On the big plane front a Ukrainian Antonov 124 just went over heading for Brize Norton, according to Wikipedia still the largest military transport aircraft in current service.

Pretty much at the same time as another Emirates A380 left Heathrow for Dubai. And the BA A380 G-XLEK is still lurking at Heathrow.

Strange they don't list the Antonov 225 as the largest, with its six engines and 32 wheels! Would hate to be checking the tyre pressures on those. Maybe because there is only one of them.

Wikipedia do indeed list the An-225 (Mriya) as being developed from the An-124 but the only one is run by a Ukrainian commercial transport company so not in current military use. I think the reference to current does mean military use, the Russians still have several An-124s for example.
The one heading to Brize Norton was presumably a Ukrainian commercial one......

No longer, it returned to the boneyard earlier this afternoon.

That Antonov 124, registration UR-82009, has been going back and forth from Brize Norton.
Today it went from there to Sarajevo and has just returned.

I only know because I saw a very large plane glinting in the sunlight high up, just around local ground-level sunset here and decided to see what it was.

Blurry iPhone zoomed picture attached. It was returning from Sarajevo though with no destination, but just landed at RAF Brize Norton.

Probably on UK lease for logistics shipments, i used to lease one through Heavylift in the late 90's to move late delivery aero engines to Boeing Everett from EMA.

It depends on your definition of largest.
Excusing the AN225 (as stated elsewhere it's now being used by a commercial outfit, so isn't 'military'), the other very large transport is the US C5 Galaxy, which was the worlds largest plane outright for nearly 20 years.

The C5 Galaxy is longer than the AN124 and has a higher Gross weight.
AN124 has a greater wingspan and beats the C5 in payload by 20 odd tonnes, making it a (slightly) better transport (127T vs 150T payloads).

All three (C5, AN124, AN225) are beaten in wingspan by Howard Hughes' H4 Hercules "Spruce Goose"! At nearly 100m across, it was only beaten in wingspan itself by the experimental Boeing Stratolaunch just over a year ago. So a 72 year record!