If you have paid UK VAT for items for personal use then there should be no additional taxes as far as I know. If you are importing stuff for resale then that's a different matter.
If I order something online from the UK (an LCD TV for 750 sterling + VAT), pay for it using my personal Credit Card, get it delivered to to my work address and have access to my work VAT Number, do I have to pay VAT on the item?