Basically yes. They’ll need to show the items to HMRC, as well as return ticket, and the items should be new, that is not worn or used. I’m not sure of the process from presenting the items to checking them in, but I’m sure that will be explained by the Revenue men.
I had in the back of my mind a 3 month limit, but I could be wrong on that one.
With everything stamped. there is a desk after security where the refund will be made. If it’s a stores own scheme then the papers will have to be sent back to them for the refund.