Alternator?

Going into Lincoln to refuel at the Blyton track-day my charging light came on so I headed home while the going was good.Typical Lotus the light went out just before I arrived home!Now it’s on all the time and I just wondered if it’s most likely the alternator or is there anything else it could be that I can check.It was a hot day but the Zircotec + air-con made the interior fine on the way home.

Wire off or loose belt Dave?

How did everything go apart from that,Graham?Blyton is good fun-much better than it seems at first.