Welcome, Richard, you'll find this forum a great resource. I thought twice about the gold membership too but have nearly raked back the premium with 3 discounted purchases at Halfords. Different people/different needs etc.
Missed out on that and am paying the Premier premium for the high list price. At less than a quid a day I convinced myself the instant I saw the car that it's worth it for a few years and I'd rake the money back by driving economically. Well, that was the theory.. 🙂
That sounds like a relay chattering but others with greater knowledge will confirm why that might be. I'll connect my NOCO charger tomorrow and have a listen, I've not sat inside whilst it's connected in the past