It's an avoidance manoeuvre and so HASELL checks by the student in the setup are silly. Remember that the human brain will revert to the first taught response under pressure.
Wrong, the test requirement is not an avoidance turn
What you are suggesting then is that a pilot confronted with a head on collision will go through a HASELL check, including a 360 degree clearing turn turn before making a avoiding turn to miss the traffic, thats as ridiculous as saying that a pilot who stalls the aircraft will do a HASELL check before recovery because that's what he always taught to do, how ridiculous.
Ask yourself why that manoeuvre is in the test schedule in the first place.
Ask yourself why the test calls for a 1) 45 degree turn through 360 degrees and 2)a gliding descending turn and YOU might be able to work out that these are not collision avoidance turns. A collision avoidance turn is an instant entry max rate turn to the right through 90 degrees and thats all. I t doesn't have to be on a syllabus or on a skill test programe for a thinking conscientious instructor to be able to teach it!
If you feel that a silly HASELL check has no relevance fine but I wonder if you would authorise a student in a Tomahawk to do a max rate steep turn over the centre of Birmingham at 500 feet agl?