Did the car turn over slowly when you tried to re start it? I had an XR3i a few years ago that did something fairly similar, it was spinning over at normal speed but wouldnt fire. I left it for a few mins an it started again. It done this to me several time in half an hour and then the dash lights went off, clock, radio etc. I got it home and checked the battery with a multimeter and it wasnt charging so it got a new alternator and battery and was mint, never missed a beat. Might be worth tryin? Kwik fit or any local garage should be willing to check it for you for free. Good luck with sorting it mate.