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Smiffy2k9
not a solicitor
a warrant is needed to search a dwelling(but not sheds, gardens etc , guard can open the gate and walk in, customs i believe too), if there is a crime going on inside a dwelling aka smell smoke see lads sitting around smoking , they will walk in no bother, i believe that a caravan is a dwelling but not 100%.
The guards are not going to suit up go over and "ask permission" lol, they will get the warrant first , if they get a warrant for the parents house i am not sure if would include your private dwelling the caravan, but we all know that the guard will probably go ahead and search it any way "how did we know it was a dwelling", plus if they find stuff judge wont care.
1 clear house just incase, better to run away and fight another day, 2 get the brother sorted now, if he does something down the line, hurts somebody there will be alot of regrets and tears, 3 purely piss in the wind idea but perhaps go to a hardware shop , get a private residence/property sign and post box and stick them on the font door of the caravan, never know guard may think twice about going in depending on the warrant (im probably wrong).