if one's out, Royal Mail never even tries to see if a neighbour is in and certainly never tries to redeliver it (unlike every other carrier). If you do not see a card, there is no way to know they ever tried, and without the card there is no way to chase it. Even if the card is seen, redelivery is always days away and necessitates a full day's leave for the unlimited delivery times Royal Mail offers. Since they deliver mail here daily, it is beyond pathetic that automatic redelivery isn't even attempted with the expectation that the recipient must organise everything including holiday leave. No other service is quite this useless and I will avoid all suppliers who use Royal Mail as their carrier.