Hi Jonathan
I had a similar problem when i purchased my car back in 2016, it is a 2009 car but had only covered 900 mls.
The same indicator bulb as yours was not working only intermittently, after lots of head scratching someone on the forum said that there had been a problem at manufacture with this unit.
Apparently there had been a call back at the time but I’m assuming many could have slipped the net.
I contacted Caerbont and asked them to have a look at it which they did, it was returned to me fully working and with no charge !
I have to say it was away for about 6 weeks if I remember correctly.
I think I would be contacting Caerbont .
Good Luck
Kingsley