it is 1.21 am - just got back. puncture .. dark lane. torch in teeth... new tube went bang with CO2.... amazingly tyre stayed up for about 2km. then went down. called cab... will update tomorrrow
OK, I posted the original question, and the update above.....here is the full story
I cycled to Romsey (17km) met friends, had about 3 pints over the course of the evening followed by a curry. I then left about midnight to cycle back. About 6km from home in a very small very dark lane which only gets about 1 car an hour during the day, certainly very little at night, and where the nearest house is about 800m away, I get a front puncture.
Luckily I have all the stuff including a new tube and a CO2 pump. Using one of my lights in my mouth I managed to change the tube. When I had the tyre back on it felt like there was an empty bit at one spot, and looking back I should have realised! This meant part of the tube was sticking out from under the tyre beading. When I applied the CO2, very loud bang, and a massive rip in the part of the inner tube outside the tyre.
But the tyre stayed inflated! The tyre beading must have clamped down on the inner tube sealing it off
Worried it would go down, I set off again asap and managed another 2km before it went. Although I had a patch kit I really couldn't be stuffed, and at this point called a taxi which came within about 8 mins.
What was very weird was that half way through my puncture repair, a vehicle came slowly down the lane. It was a paramedic ambulance! She slowed to check I was ok, and when I asked her what she was doing down there she said the satnav directed her that way to Chandlers Ford. It is the right way but runs directly parallel to a fast A road, so I was puzzled. She was also driving pretty slowly. Odd....
Home safely though!