Well done that warden. 

 Were you 'told off' or simply told that you may not use a splitter?

So ,has the warden made their own rule ?

I doubt it. More likely following club policy rather than a rule. 

I must be a bit dim,  but what is a "splitter"? 

Plugs into bollard and has two sockets coming off to allow two hook up cables normally. The club does say 'Shorter cables may not reach from the bollard to your van on some sites and extra connector cables to add length are not permitted.' Probably why the warden said no. 

https://www.amazon.co.uk/Sockets-Splitter-Generator-Distribution-Caravan-Orange/dp/B075VDRVTS

Thanks, Alan. So it seems the warden was doing the right thing then?

I guess a splitter at the caravan end would be Okay as that is what many of us have with that 240 socket on the awning side of the van.But one on the bollard I can see as being unhelpful. They can impede others plugging in the provided sockets and cause more cables across the 'common' areas around pitches. Just the one cable out from the hook up bollard seems very reasonable, safer, sensible and tidy to me. If you want to split, do it at 'your' end on your pitch!

I think so Moulesy