Gloucester Hartpury prop Mackenzie Carson first played rugby aged nine, playing for her home club in Canada all the way from junior to senior level.Having previously earned three caps for Canada, including one against England during the Autumn Internationals in 2018, Carson has made herself available to play for England under World Rugby’s birth right transfer rules which allows a capped player to switch allegiance to another country they are eligible to play for following a three-year stand-down period. She featured in Simon Middleton's squad for the 2023 TikTok Women's Six Nations and travelled to New Zealand for the inaugural WXV tournament. England won the title with victories over Australia, Canada and New Zealand. Mackenzie was recently named in John Mitchell's squad for the Guinness Women's Six Nations 2024.