Update
Well the pump was fitted, all appeared A-OK. Start the engine.
We had none of the screeming like last time when at idle or revved, however upon turning we had PS growl, not as loud as before. Maybe trapped air.
Took her for a spin, on the straight & narrow its great, but all turning was accompanied by PS growling. Did the usual lock to lock several times to expell any air. Still growling. Parked, went inside to scream.
After a while I saw PS fluid on X member under pump, Oh! NO. Cant be still a leaking pump. Cleaned it up and tested for the source but the pump, in & out hoses etc were as dry as. Went for another test run, still growling, parked up, refilled fluid as now low.
Went for a cuppa, maybe if I calm down. Came back out, now fluid running down the driveway, not from pump - but pump resouvior, because of car incline it was dropping clear of the X member, straight to the ground.
The lower resouvior port which feeds fluid into pump was leaking, the hose clamp was gone !?. Cleaned up again, fit new clamp, without losing all the new fluid, run car, the growl is gone, once again clearly indicating how a SMALL suckion leak can cause the fluid to be hyper ventilated, frothing up and causing the growl.
If left, this condition will cause cavitation in the pump and thence damage.
The car is out of the garage (don't tell B - she'll want to put the Mustang in there) - now for a pink slip.
I suppose she'll want those 3000 tiles laid now.
Oh! Did I mention engine has a strange miss - running on seven (7) ummm another job.