Catholics in England and Wales are being urged to complete a worldwide survey into how they think the Church deals with issues such as contraception and gay marriage.
Pope Francis launched the unprecedented questionnaire earlier this month.
The responses will help form new Vatican guidance for an estimated 1.2bn followers to be published in 2015.
The Archbishop of Westminster, Vincent Nichols, said it would help Catholics face the "ambitions of modern living".
The Roman Catholic Church in England and Wales was the first in the world to put the survey online, and is encouraging all Catholics to respond by a 30 November deadline.