Just been to check my tyre pressures as the car felt a little wallowy, placed the inflation nozzle on the tyre and "whoosh" it's pushed the valve inside the wheel
Just come off the motorway too

Bloody hell taztastic never seen that happen before.
I think you should buy a lottery ticket today. MY13 HSE LUX Aintree Green
MY57 SE Stornoway Grey. Gone
Nissan X Trail
Discovery V8 LPG
Series II Land Rover

Had a similar thing on our Suzuki. Got home went inside, came back out and offside rear was flat as a pancake. I poked the valve and it just fell on the ground. Rubber had perished/rotted and the tyres had been changed less than a year previously. Went round to the nearside rear and casually poked the valve, this promptly blew across the driveway.. Thought better not poke the front ones. Took them back to the fitters (fortunately just round the corner) and they seem to have had a dodgy batch of valves a while back. I would have thought they could have contacted those that might be at risk. They did change all 4 for new ones for nothing. FL2 Metropolis, Loire Blue, ebony/ivory

was the wheel and tyre hot/warm at this point? . heat may soften the valve stem At work
At home

"I can't always believe facts I read on the web" - Charles Dickens

winner by default of the tractor vs caravan race

Didnt feel hot, although I rmemeber looking at it and thinking they had fitted a short valve and then whoosh, followed by and more .
No spare and a useless tim of foam, so one of the minions brought one of my other wheels, a trolley jack and a wheelbrace, all sorted now, garage were very apologetic, well I think they were, they're Banglamanians or something.

Never seen that before.

Did the tyre remain inflated Taz ? Hard to tell from the pic.

Note to self. 70mph max.