Christian formation is "a continual process in the individual of maturation in faith and a likening to Christ, according to the will of the Father, under the guidance of the Holy Spirit." (On the Vocation and Mission of the Lay Faithful by St John Paul II).
The Church's catechetical mission aims to help the faithful of all ages to grow in both human and Christian maturity, enriching the whole of life with the leaven of the Gospel, embracing all the faith dimensions of an adult life and engaging the particular needs and interests of the adults in each local community.
All the baptised, whatever their stage in life, whatever their intellectual, physical and emotional abilities, because they are called by God to maturity in faith, need and therefore have the right to adequate catechesis (General Directory for Catechesis, 167).
A network of advisers in dioceses across England and Wales work to promote and support baptised Catholics to do grow in holiness and in their understanding of the Catholic Faith. The advisers offer a wide variety of resources and events - talks, courses and reflection days - and can be contacted via their respective dioceses.
One of the principle ways that adult formation is served is the Catholic Certificate in Religious Studies (CCRS). Diocesan centres and institutions of higher education across our countries run the CCRS, overseen by the Board of Religious Studies on behalf on the Catholic Bishops' Conference of England and Wales.
The bishops' emphasis on adult formation and ongoing catechesis has been stated in the document The Priority of Adult Formation which can be downloaded here.