Posting this a second time as the first attempt appears to have gone down the plughole. Had my first puncture in years on Friday (8th May). Car hadn't been used for a couple  of days and the rear tyre was completely flat. The good news was that the tyre pressure alert system worked. I pumped the tyre back up and drove from Tewkesbury to Cheltenham where Formula 1 removed the screw and repaired the tyre while I queued at Sainsburys.  The worrying aspect is that had I been somewhere other tha