Hi there
You cannot reclaim VAT for goods sent to Murcia unless you are shipping to a VAT registered business in Spain. The Spanish business would then have to charge IVA (Spanish VAT) when they resell the goods.
As a private person you cannot reclaim VAT for goods travelling to another EC country. There is no import duty between member states.
Regards
Jean
PS If you require further info ring your local HMRC enquiry office. The number should be in the phone book.