Nissan micra 1.2 s auto 53 plate doesnt start, crank or turn over!!!!!!!!!!!!!!!!!!!!

My nissan micra 1.2 auto 53 plate doesnt start.. put the key in, turn to ignition, all lights come on, nats indicator light goes off after a short solid red, turn key to start and then nothing. It doesnt crank and no light dims. Play around with it for a while and then it starts!. Seems to continue working once you can get it started but park it for a few hours and then it is same story. But it seems to be getting worse now. Any ideas please?. Many thanks:(