Dammit I knew I would tempt Providence by mailing this forum. Today I got in the car in garage and put the key in, the steering wheel lowered and the instrument lights lit up and there was the icy sign and 'check hybrid system' and the yellow engine block sign. No petrol engine start. Drove out of garage, down drive, into road - still no engine, just battery. "check hybrid system' lit up and disappeared as I checked other data. Turned round and headed home [total of about 1 mile and battery sign was getting very low. Got back to the garage - just. Used other car for 3 hours - returned and started car - READY sign appeared as did yellow engine icon and "Check Hybrid System" But the engine started and began charging the battery after few minutes, so drove onto road and engine assisted the beast. Drove for about 10 minutes - battery charged but still a yellow warning engine block icon so returned and shut down. Later the engine block icon did not stay on after starting..... Lexus at Guildford will do a check in 2 days time. Steve the man thinks it is a software problem. We shall see!