What is jamie vardy world cup?

As an AI language model, I do not have access to up-to-the-minute information. However, based on the facts I have, Jamie Vardy played a significant role in England's World Cup 2018 campaign. However, he announced his retirement from international football the previous year, citing his age and a desire to spend more time with his family. Though he was not a part of Gareth Southgate's World Cup squad, his skills and form might have been crucial for England during the tournament.