British coinage on Roman rule is divided in 2 parts:
usual Roman coinage, like your coins bearing, for example, PLN (for Londinium), and I know there are others too but most unlisted yet, but as this coinage is in Roman standards, they belong to Rome (ancient);
maybe a Provincial coinage (like Celtic-type coinage minted after the conquest, but maybe also other types I did not see yet), which for now would be added in Roman Provinces.
We're under discussions with all Ancient times referees, and we'll have to see how to manage the new system if needed to create sublistings.
Administrateur du catalogue, référent de nombreuses nations antiques et de la Lorraine.
Catalogue administrator, numerous Antique nations and Lorraine referee.
As in charge of those countries, I still disagree concerning the classic Roman coinage. Most coins you're expecting also belong to the Roman Imperial Coinage catalogs and directly belongs to the Roman currency system. Some countries are also using coinages adapted from the Roman currency but are client states (Mauretania) or trade step states (Aksum). Britain isn't.
Administrateur du catalogue, référent de nombreuses nations antiques et de la Lorraine.
Catalogue administrator, numerous Antique nations and Lorraine referee.