The post office, to get your mail redirected?
(More helpfully, I would guess that if you email Danial at his LEL address he'll either sort it out or pass your details on to the right person. Don't be surprised if cards aren't back until the new year though - LRM homologation can take a while, so there isn't an immediate urgency.
Meantime, I'd also update your AUK membership details if you're a member and have other rides planned.)