Originally Posted by
David-A
Go up to the higher level in T5 (where people emerge from securirty into the departure lounge), and there are signs directing you to the counter so you should have no dificulty.
For clarity, it might be worth noting that transfer security is at the north end of the terminal building, so the OP will emergen from north security - but IIRC the VAT refund office is at the other end of the terminal near where people emerge from south security.