Book of Common Prayer (page 432)

At the Eucharist

The liturgy then continues with the Offertory, at which the newly
married couple may present the offerings of bread and wine.

Preface of Marriage

At the Communion, it is appropriate that the newly married couple
receive Communion first, after the ministers.

In place of the usual postcommunion prayer, the following is said

O God, the giver of all that is true and lovely and gracious:
We give you thanks for binding us together in these holy
mysteries of the Body and Blood of your Son Jesus Christ.
Grant that by your Holy Spirit, N and N, now joined in Holy
Matrimony, may become one in heart and soul, live in fidelity
and peace, and obtain those eternal joys prepared for all who
love you; for the sake of Jesus Christ our Lord. Amen.

As the wedding party leaves the church, a hymn, psalm, or anthem may be
sung, or instrumental music may be played.