I did a job sunday night on a door like nothing ive come across before.The lock wasnt working so i had to strip it down and take a look.This door has multiple shot bolts made of 20mm thick steel. The lock, a 4 way euro dimple lock, is protected by a rose about 20 mm thick all of the way round. The protective rose looks a bit like a hockey puck.The brand is called gardesa and is something you are not going to get through forcibly. check out these site for more information on them and look at how the lock has and extended tail to attach a door knob.Look at the euro examples then look at the fact the door can be supplied with a double bitted safe type lock !! You wouldnt even guess it was anything special as the door come covered in a plywood finished to your choice,very deceiving.
http://www.gardesa.net/home.aspx
http://www.gardesa.net/blindPorta.aspx?XP=0&XS=2&CS=0&MP=
http://www.gardesa.net/blindPorta.aspx?XP=0&XS=1&CS=0&MP=
This job was a headache as the lock had totally failed and the construction meant that only a euro cylinder with oneside 25mm would fit. I had to fit a 25/25 thumbturn cylinder as a temporary solution so they could go out and advised they contact the manufactuer. Picking the lock would be harder due to the rose and new longer picks and tension tools would be needed, a nightmare entry but a nigel rose product could work in theory, and i shall say no more than that in the open forums.
This is something i would consider fitting in a high risk area as it even has the option of ballistic protection !!