The Diocese of Guildford follows the stated position of the Church of England on same sex marriage. You can view the pastoral guidance on same sex marriage on the Church of England website.
What may clergy perform for civil partnerships and same sex marriage?
Guidance for clergy when it comes to acts of worship following civil same sex weddings comes from the pastoral guidance on same sex marriage from the Church of England and is reproduced below:
Acts of worship following civil same sex weddings
19. As noted above, same sex weddings in church will not be possible. As with civil partnership, some same sex couples are, however, likely to seek some recognition of their new situation in the context of an act of worship.
20. The 2005 pastoral statement said that it would not be right to produce an authorized public liturgy in connection with the registering of civil partnerships and that clergy should not provide services of blessing for those who registered civil partnerships. The House did not wish, however, to interfere with the clergy's pastoral discretion about when more informal kind of prayer, at the request of the couple, might be appropriate in the light of the circumstances. The College made clear on 27 January that, just as the Church of England's doctrine of marriage remains the same, so its pastoral and liturgical practice also remains unchanged.
21. The same approach as commended in the 2005 statement should therefore apply to couples who enter same-sex marriage, on the assumption that any prayer will be accompanied by pastoral discussion of the church's teaching and their reasons for departing from it. Services of blessing should not be provided. Clergy should respond pastorally and sensitively in other ways.