Baxi Solo 3 PFL 50 gas boiler - Pilot light keeps turning off?

This just started tonight — Baxi Solo 3 PFL 50 gas boiler was running fine but then we noticed the radiators getting cold. Looking at the boiler all the lights were on bar the burner light and the blue pilot flame was out. The fans were running as well! Then after about 15 minutes the blue flame came back on but only for about a minute!

This went on all night until the boiler went off at the timer!

Would this be the thermostat or something else?