Can I exchange or refund a tax-free item?

Items purchased in other countries can be refunded for store credit or exchanged within stand alone stores in the UK except for Selfridges, Harrods, Heathrow and Westfield, provided the store offers this product category. 

For international purchases with tax-free claims, the item can be exchanged for an item of same retail price or refunded for store credit for full amount without tax. When exchanging for an item, the difference between tax-free price and UK retail price must be paid to Louis Vuitton.