After reading this link, https://www.vatfree.com/en/for-trave...q-requirements , I didn't realize that the minimum threshold for VAT refund is only £30. I will be on a ~10AM flight to JFK on a Tuesday morning at T3. I would just as soon do the VAT refund process AFTER security.

I haven't done VAT refund in years so I have a few questions.

1. How much time should I allow to be refunded so I am not rushing for the ~10am flight? Is there another security line at the T3 gate?

2. At T3, which is easier and faster for the VAT refund: The Customs desk (how many are there?) or Travelex (how many of them are there?)?

3. The form I get from the store must have some sort of stamp from them on the form? Is there anything else I need the store to include (or I should include) for the VAT refund?

4. If I buy perfume and do NOT open it, will I be eligible for a VAT refund assuming the price is £30 or over?

5. Will I be refunded immediately at LHR?

Thank you!