Hi Mandy,
Presuming you know your way back to San Javier Airport, it's easy. Take exit 782 off the AP7 (one exit past the airport) signposted for Balsicas / San Javier onto the C3319. Take the direction of Balsicas / Murcia heading west and go along there for around six miles. You will see Polaris stand out on the left. Take the exit marked "Poligono Industrial" and cross back over the C3319.
Alternatively, cut across country into Torreo Pacheco and theres a road from the centre of town signposted for Balsicas / Roldan. Take the split for Balsicas. Just as you're about to cross the C3319, Polaris are in the estate on your right. Takes around ten minutes from Torreo Pacheco.
Regards, Julian.