The road layout in a car park is covered mostly by the road traffic act, not sure about the pavement and walkway areas.
I got summoned back to my bike via the pa when I did the same thing at Freeport, Fleetwood. The thick-as-Shit security guards tried bullying me into moving my bike, or it would be towed. I just laughed and said "try it". They have Bugger all powers to do that.
He did make a point though, he said about toddlers maybe burning themselves on the hot bike parts, someone would be to blame, and it would be me as its not in the car park. Just another thought......
Car exhausts get hot as well, he was talking absolute bollox!
Stick the bike bang in the middle of a car space, and if anyone whinges tell them to foc off.
Avoid pavements and "quiet spots" as it gives them a tiny bit of leverage because there's no real excuse to park there, just be bold and use a normal slot.
In reality they are "parking spaces" rather than "car parking spaces" unless otherwise described, ie: disabled bays.
Having motorbike bays is normally just an afterthought to keep bikes together, and out of the way.
A bit like ordering 20 crates of beer for the lads, then chucking in a bottle of sherry for the ladies.