Face value.
Some very new coins that are not yet in circulation have ‘N/A’ in their Used value box, this is simply because the coin is so new that there are none in ‘Used’ condition.
The Check Your Change admin is Mr C H Perkins, publisher of numismatic publications in printed and eBook format. Author of "Collectors' Coins - Decimal Issues of the UK" and other books on British coins and related subjects.