Hopefully we will be moving in the not too distant future, so, if anyone can help, where can I get cardboard boxes to pack the stuff in on the Costa Blanca South?

Ikea in Murcia sell cardboard boxes, but you could also go to big supermarkets or electric appliance shops (ie Masters, Aitana, etc) and ask for some.

Best of luck Mike

Also you can ask for them (free) at cigar stores. They are very big and very strong