For the Tudors and the Stuarts up to and including Charles II, Although the left/right alternation is now considered to have begun with Charles II, coins of both types were manufactured during his reign. See https://www.britnumsoc.org/publications/Digital%20BNJ/pdfs/1919_BNJ_15_9.pdf both left- and right-facing portrait images were minted within the reign of a single monarch (left-facing images were more common), together with equestrian portraits on certain coins and (earlier) full face portrait images. In the Middle Ages, portrait images tended to be full face.
For the Tudors and the Stuarts up to and including Charles II, Although the left/right alternation is now considered to have begun with Charles II, coins of both types were manufactured during his reign. See https://www.britnumsocorg/publications/Digital%20BNJ/pdfs/1919_BNJ_15_9.pdf both left- and right-facing portrait images were minted within the reign of a single monarch (left-facing images were more common), together with equestrian portraits on certain coins and (earlier) full face portrait images. In the Middle Ages, portrait images tended to be full face.