The curious thing with Beneath a Steel Sky is that two versions (disk based OCS ones not CD32) did exactly the same. The game runs fine, using the linc terminals works, selecting security then special operations causes no problems. Then trying to select file adjustment causes it to freeze.
The entries in guruhistory (MCP) say someting about Illegal Address Access (i.e odd).
As for Liberation, it was from Ebay so it could be a bad Cd I suppose.
Thaks your help everyone.