Drove to Luton Airport this morning. All fine.
3 hours later to go home, car unlocked, then dead. No lights, no ignition, nothing ...
Called Lexus Assist ( AA).
30 minutes later, they arrived and the car has started.
The problem?
The connection to my battery had come loose(!), so it was effectively disconnected for maybe 3 hours.
It took about a minute to be fixed.
It's never let me down before, so I WAS surprised!
I guess the car has to re-learn stuff now. Certainly some of memory settings have gone... But a happy ending.
Top Tip: Keep a coat in your car. I had one ( a high viz ) and was I grateful!