Thank-you all for the responses on headlowering. It has been really helpful and
given me lots of improvement steps to the full behaviour.

My original question was really me pondering the two training principles that we
should stick at an exercise long enough to get the benefit but that we also need
to keep things in balance.

It's clear to me now that the full behaviour will take many many training steps
to achieve so the answer seems to be "yes", keep working on it and "no", not all
at once!

Before my thread I had only HL in the field. Yesterday I walked him down the
lane to the yard. We met a stallion in a cart on the way. Rannoch DID lower his
head but pinged it straight up again!...we clearly don't have HL with relaxtion
and duration and in any environment yet and probably won't for months to come!
However I'm taking one of the ideas that came up on the thread and starting to
incorporate HL in my everyday routines.

fantastic that we have a forum to ask the question it makes the whole process so
much more enjoyable!