MIG wrote:

It just occurred to me that a more important issue affected by the
same pointless limitation is refunds. I think that the same applies,
that when a refund is owed to you, you have to make a LU journey.
Auto top-up is a choice, but having to make a journey to get your own
money back is rather cheeky. (And having to register, but that's
another story.)

An unregistered card can't be issued a refund? Then how are non-UK
residents expected to obtain refunds? (When I tried to register my
Oyster card to a USA address in 2005, I was told that only UK addresses
were valid.)
--
David of Broadway