Skoda Octavia glow plug light flashes when driving goes of for a while once car restarted

Check brake lights are all operating , if the brake light switch at the foot brake pedal, or both main brake lights have failed it can trigger this light

Brake lights working at the moment but light is not on

Double check the brake lights when side lights are on also as this sometimes affects if bad earth or any fault in light cluster . May seem strange that this triggers the light , but it is a known and common factor .