Anyone know what happens to your existing credit when your membership expires? Obviously no membership means no new money hitting your balance, but does the balance remain to spend after the membership expires, or does it zero out on expiry? How about tickets that were bought whilst a member, but flow after membership expires?

Best I can work out from the website, the credit should remain (as that's in TravelBank, which doesn't require any membership fees), but there's no real mention of the book before/flown afterwards case...