I have a brick wall about to be rebuilt. It's about 5 - 6ft high and is a
9" construction, rather wobbly on it's lowest course and hence dangerous.
It's about 8ft long and is a free standing construction without piers. The
builder has been instructed by the landlord to reinstate the wall as it was
without any piers.

I presume this doesn't follow good working practise. However are they any
guidelines published of what is and isn't good working practise?