Re @Trevor_pott
"Our lives are on those machines. Search them hard enough, you'll find something to jail them for"
If you give me six lines written by the hand of the most honest of men, I will find something in them which will hang him.
"even if it's not what was on the original search warrant."
That's another reason why I prefer the US system, if the alleged crime isn't on the warrant, you do not get to include it on the charge sheet!
They may seize objects not specified in the warrant only if they are in plain view during the course of the search. So keep your drugs out of the way if they're looking for PC gear for example.
But in the UK, they can do what the hell they like.
It speaks volumes of how much trust the UK sheeple place in the law.