Locks that work

they were well prepared and seemed to make light work of the first two locks (my dad is paranoid) but they couldn't get through this
http://www.trelock.de/trelock/t2/en/produktdetails.php?id=rs440&pfad=schliess
they had torn it to pieces but couldn't get it off so they left the bike in the lane. they're way strongert than i thought.

irish mick, I had a look at this, but since Trelock themselves only give this a level 4 rating (6 is best rating), I won't include it. I have found a new lock from Trelock, and I added that (MB600).