No probs.
I have found the solution, just needed to replace the way the motors were being called.
The new code relating to my two stepper motors looks like this:
stepper2.moveTo(m2val50); // where m2val is a variable I've received from processing
stepper2.run();
stepper1.moveTo(m1val50); // same for m1val
stepper1.run();
Best
Faeve