So I drove my Octavia VRS tonight for about an hour or so then came home and parked up as normal but had to go back out later, when I went to start the car she was dead so bump started her and drove for 45mins or so switched off and tried again and battery still dead??? No lights or radio left on and no warning lights...

@Karlvrs Which suggests that the battery is "really dead". Do you have a multimeter? If so I suspect you'll get at best 10.5, maybe less, across the terminals engine off.

Mine did exactly this when battery died. would start fine first thing then after driving if i stopped at a petrol station it wouldn't start unless bumped.

Did this for a few weeks until one cold morning where the battery had completely failed and i couldn't get it started at all.