In the CofE worship and doctrine have always been closely linked. Canon A5 declares that the doctrine of the CofE is 'grounded in Holy Scriptures...in particular such doctrine is to be found in the 39 Articles...the BCP and the Ordinal'.
For over 350 years now the 1662 BCP has been at the centre of our worship, its place in the on-going life of the church is guaranteed in law. The introduction of the Alternative Service Book in 1980 introduced much new material, largely in contemporary language. This was a major step in liturgical revision and set in motion a program of work by the Liturgical Commission which ultimately led to the publication Common Worship in 2000.
The development of this new liturgical material has also seen changes in the way the CofE, through the work of the General Synod, undertakes liturgical business. This has allowed greater variation and flexibility in worship whilst safeguarding the doctrine and teaching of the church. We now have two categories of material available for use in Common Worship - authorised and commended material. Authorised material included prayers of penitence, Creeds and Eucharistic prayers which by their nature reflect the doctrine and teaching of the church. Only authorised forms of these texts may be used in main services on a regular basis. Commended material has been approved by the House of Bishops for occasional use in specific situations or occasions. Much of this material is seasonal or takes account for the need for more appropriate material for use on specific occasions or with specific groups of people.
As Naomi pointed has already pointed out, Common Worship allows for a great deal of flexibility. When I trained as a Commissioned Lay Minister in the CofE we were actively encouraged to explore new and different ways of 'doing church' - to quote Naomi "You have to meet people where they to keep church relevant, and to preach the gospel anew in each generation."