With a receipt for a mooring, I would not move in the dark on a poorly lit river under any circumstances, unless my own boat was in danger (e.g. about to be crushed by a returning barge).
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From memory, their policy is to allow only members of the club to stay alongside at weekends (im not a member). But as the OP was given permission by someone and paid his dues, in my view he should have been allowed to stay.
Well you can't just come back here with that news without some follow up ??? ... what ... where ... etcMorning.
It never did put me off and I have since got the bug for boating. I currently am writing this from my bigger boat that I picked up this week;-).
Thanks ian