Useful lessons learned in short;
1. You can't rely on the Nissan recovery plan when punctured if you have no signal with which to contact them and nobody can be found at home nearby as happened in our rural locale today.
2. You can get 8 miles on a total flat when the tyre is beyond repair at about 15 mph before the tyre finally shreads itself as it did 100 yds from home. Even after that the rim never touched the road and may still become the emergency spare.
3. The puncture was 8.4 miles from home when the GOM read 18 miles and I wondered if I had enough battery and rubber to get back. I was home on country lanes with 6 miles spare on the GOM so 12 GOM miles used to get 8 miles with a total flat so 2/3rds normal driving range...pretty good considering all including 2 x 300 ft deep valleys to negotiate!
4. Never trust an overgrown grass verge not to have a kerb hidden in it on the inside of a tight bend in N.W. Oxfordshire. This was particularly annoying as there was a gap of 3 x meter long kerb stones missing to allow the road to drain without the usual chamferred/tapered kerb ends so viscious hidden vertical sharp pointed right angles, our councils local weapons of mass destruction!
Please note this was a nearside rear puncture. The front may be a bit more awkward due to steering, the weight is roughly 50/50 split I believe.