Westwood 1300 -no ignition-working OK 'till turned ignition off then on !?

On my Westwood 1300m I turned the ignition switch to 'on' - lights all came on, on the panel - then distracted and turned switch off, then immediately back on - no lights came on and the mower appears' dead'! - have checked the fuses and all appear OK (was working OK and was in use for the hour previous)