Regrettably, VAT receipts or invoices are not available for items purchased online.
This is due to they are mail order goods which include internet sales delivered outside of the UK. Unfortunately, not all UK retailers offer tax-free shopping.
The only documentation you will receive is the confirmation email and the Delivery & Returns Note included with your delivery.
You can find more information on the following link
https://www.gov.uk/tax-on-shopping/taxfree-shopping
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