Boffinville has decreed that the pilot, of
any aircraft being vectored below the Minimum Vectoring Altitude, be absolutely aware that terrain and obstacle clearance is his responsibility.
Mostly, this should apply to a take-off clearance, or vectoring into the circuit
So, as MATS Part 6, Annex 6-12 says
when a VFR aircraft, or an IFR aircraft is cleared for a visual departure, is issued radar heading instructions
the phrase used is
MAINTAIN RUNWAY HEADING/TURN RIGHT/LEFT HEADING (degrees) VISUAL CLEARED FOR TAKEOFF
or
When an aircraft is issued a radar heading instruction below the MVA or MSA/LSALT
then it's
TURN LEFT (or RIGHT) (number) DEGREES or HEADING (three digits) VISUAL
If we don't say this you'll deliberately fly into ground to spite us.
CG