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What happens when you get a puncture in a run flat tyre?

I thought it just maintained it's shape and continued working due to the strength in the sidewalls?

The tyre indicator pressure thingy went off on my car earlier and wouldn't clear with a reset. When I checked the tyres the passenger side front looks weird. Best way of describing it is that the bit between the sidewall and the tread has stretched about 1.5cm - looks totally different to the other front tyre.

Tried Googling it but came up blank. Anyone got any ideas?

Run flat tyres are only a get you home measure,usually fitted to cars that don"t have the space for even one of those them there  "space saver" spares.
I think they inject a kind of resin,to plug the hole(ooh matron) but the tyre cannot be repaired.
If you drive a car with those fitted,a new tyre should be well within your budget.

Get some new tyres?

:D

Never heard of these before. Surely if it's running flat it needs replacing or am I missing something?

Run flats as far as I'm aware are good for a few miles when you get a puncture. The puncture cannot be fixed and a new tyre is required. My car had run flats as standard, but when I bought it a previous owner must have put normal tyres on. I wouldn't have run flats personally. Check with a tyre centre for professional advice!   

It would appear I over estimated how good a job run flats did with a puncture, they don't hold out for long and you need to keep the speed really low. Good enough to get you home or to a garage at a crawl but not much more.

Not sure I have much choice but to stick with them as there's no where to put a spare.

Many new cars nowadays don't have spare wheels, and are an optional extra, so the alternative is run flats.

You could get a can of puncture foam and go with normal tyres. It's what I do.

I hate the modern preference for run flats/spacesavers instead of having a full sized spare. I for one am glad mine has a full size spare in the boot.

in the same way that a dry sump engine isn't an engine that runs without oil; run flat tyres aren't tyres that need no air

Run flat refers to the fact the wall don't immediately collapse when you get a puncture so, for a short distance you can continue to drive before they collapse... but if you get a flat when you are parked up the walls slowly collapse and become misshapen in one place, at the bottom, or if you don't keep the correct tyre pressure over an extended period then the wall rim will collapse all round (which seems to be your case)

None of my last 3 new cars have had a spare wheel or even a space saver they have all had a puncture sealant and compressor in the boot that runs from the 12v adapter socket, I have used it, it works fine for the job.