Again, thankyou for your time Paul I do appreciate it mate. I had changed the while statement to two If statements as per the second set of coding I posted to reflect the fact I had followed your advice and had a go with just the hall sensor on it's own.
But for some reason when I include that code in "case 1" it simply doesn't work for a reason I can't yet fathom and it's probably something dead obvious to someone on here.