Oh dear-wrong again
Birch & Bramson show two pages of pre flight briefings for steep turns
Ex 15 Advanced Turning (Steep Turns and Steep Descending Turns) on page 227, as quoted above in my earlier post where under Airmanship it goes through a complete HASELLS check
On page 228 Ex 15 Advanced Turning (Approach to the Stall, Spiral Dive: Maximum Rate Turn) under AIRMANSHIP it states
AS FOR STEEP TURN
Mr Pratt doesnt differentiate either between what type of steep turn you are carrying out he merely states (quote) "it is usual to carry out HASELL or HELL checks before starting a steep turn.
You asked the question,
Who started the nonsense of HASELL before steep turns?
I am merely answering your question using two of the best selling UK training manuals.