Ah, I think that explains it, in Auto the lights won’t come on in bright daylight (for obvious reasons). If you push the stalk once the A symbol does still come up on the dash but if you push it again it won’t give main beam because the headlights aren’t on (in daylight with Auto on, on the lights control panel Auto is lit up amber but the headlights and sidelight symbols remain unlit as opposed to being green when they are on with Auto). I know because I happened to try it this afternoon. I had to put my lights on manually this afternoon as there was thick fog, but it was still really bright daylight, so the auto light function wouldn’t put the lights on. Whilst I was fiddling around I tried that and noted it.