Thanks everybody who helped me
I've just found the answer to my question.
I found it on DOC4444 Amendment N°4 para 8.6.5.2.
It writes: "when vectoring an IFR flight and when giving an IFR flight a direct routing which takes the aircraft off an ATS route, the radar controller shall issue clearance such that the prescribed osbtacle clearance will exist at all times until the aircraft reaches the point where the pilot will resume own navigation."
It appears clear that things has recently changed!