"NO ENTRY" sign, private car park, legallity?

[shovelheadrob]

There is a local supermarket that has a one way system around it's car park, see http://maps.google.co.uk/maps?f=q&source=s_q&a... Sorry I don't know how to display the pic.
99% of drivers observe the signs but there are a few who think it is OK to just nip through the "No Entry sign to grab the last space when it is busy. I have had "words" a couple of times as apart from the annoying fact that they have taken the space you were driving the correct way around to, I think it is illegal. I already know that there are two options from the law.
1 Failing to comply with a road traffic sign (endorsable I believe)
2 Failing to follow the prescriber route (non endorsable I believe)

Question, as this is a private car park, does the law apply, i.e is it an offence to ignore the signs?

[shovelheadrob]

Ok thanks guys, maybe I should take the short cut myself, if you can't beat them join them! I probably won't though as I suppose it's just another one of those manovueres that get filed under "inconsiderate"

[shovelheadrob]

Piersman2 said:

Sorry OP, but I do hope there's not regulation as I often go the wrong way round carparks.

Not from any great desire to get to a space quicker but just because I never look at the arrows and inevitably end up going the wrong way 'cos I is stupid

Good job I can't get fined for it!

Sorry I don't know how to post the google pic of the car park, but it was not the arrows on the tarmac which prompted this thread, rather the 2 large "NO ENTRY" signs. You would have to be blind as well as stupid to miss them!
I am guessing the same law would apply to garage/petrol/service station forecourts where they display entry & exit signage with one way & no entry?