On Fri, 23 Nov 2007 11:47:22 UTC, Frank Erskine
wrote:

A pal of mine who used to repair council-house doors once showed me.
Get the claw of a claw-hammer under the edge of the cylinder (the
softish escutcheon makes this easy really), then tear out the
cylinder. The fixing screw heads will pull through the back-plate.
Then you can insert a screwdriver into the slot in the lock and easily
open the door.
Does anybody still use Yale-type locks? Insurance companies don't
recognise them as secure nowadays.

They do if you use the BS approved ones. These have additional fixing
points, are more solid, have anti-pick pins, and have an automatic
deadlock system.

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