Just to follow up on this in case it’s of any use to someone looking in the future. I went back and tested the following:
– Tested power was getting to pump (successfully tested this time)
– Tested continuity in pump (was getting nothing here – still not sure why)
Decided it was a faulty pump and went to buy new one but stopped just before clicking Buy Now. Went back and took pump apart and found the culprit – a feckin’ stick jamming the motor. Took it out and all is right with the world again.
Thanks for the help on above – always great to learn how something works!