I'm a non-EU citizen, leaving London from Luton airport. I'm trying to understand how to get a VAT refund on my way out. All I was able to find is this very sparse description at the airport website:
You need to bring your VAT receipts and contact details to the Airport in a sealed envelope. Once you have passed through the security search area, before you go through to the Departures Lounge, there is a blue HM Customs post box mounted on the wall. Post the envelope in the box. The box is emptied by HM Customs on a daily basis and the contents are taken away for processing. If you cannot see the box, please ask any member of staff to direct you to it.
It doesn't say which products are eligible, or if I need any specific forms, or anything like that. Does anyone have experience they can share about VAT refund from the UK in general, and at Luton in particular?