If you are in the UK then you're not going to have to pay import tax/charges. If you are outside the EU then surely you are going to have to pay import/taxes on everything - so you might as well get it from gucci.com. Although if you are paying your country's tax it doesn't matter where it is shipped from - eg. if I want to buy Abercrombie, I can buy it from abercrombie.com and it gets shipped from America. But I've paid VAT on it so there are no customs charges.
But anyway, if you are in the UK you don't pay import tax on EU goods.