Long story shortened:
When my OEM pump failed, car continued to run just fine. Acting on suggestions, here and elsewhere, I ordered a replacement pump motor and then proceeded to re and re the pump motor. However I managed to break one of the hose spigots off the original pump canister so had to order a full replacement pump/canister.
That pump worked for about 40K km, with one interruption 6 months ago when the pump quit and on inspection I found a strand of what appeared to be steel wool jamming the intake. I tugged on the wire strand and it immediately ran once again.
Fast forward to 3 days ago and the wife was once again stranded in traffic with a dead pump. With the second replacement pump motor on hand I had the car running quickly. HOWEVER, this new pump motor is the noisiest (squealing and rough-sounding ) pump I have ever heard and I'm not comfortable sending the car out with her behind the wheel.
Lesson: Hang on to your original pump housing(or send it to me!!), careful with the spigots(it snapped off very easily) and I hope my experience isn't typical.
And, yes, this from DefenderTech, who has always responded well to email questions and who, I have no doubt, wishs that I had had better success with his parts.