Yes, as @h8ten says, it rather sounds like the EVSE is not liking something about earthing on your spur sockets and so will not initiate charging. Do you have one of those plug in socket testers? I bought one last year and they're great for doing high level testing of a socket to at least ensure that there's an intact earth, live and neutral, wires connect right way round etc..Tried various sockets now in various locations, I'm wondering if the car system doesn't like spurs as I can charge fine off the main socket but not a spur from that socket?
My understanding was that chargers are usually installed on a dedicated spur themselves? Or is a circuit and a spur one and the same thing in this instance?UK wiring regulations require a dedicated circuit for EV charging. Having spurs would suggest that you don't have a dedicated circuit.