The Church of England website reproduces the intercessions pages on Common Worship and has a page on which it puts current intercessionary prayers, which links to a multi-denominational page on prayers.

The Diocese of Bath and Wells offers training in leading intercessions

Here is a link to the Daily Prayer provided by the official Church of England web site.

Book Recommendations

David Adam has written three helpful books, one for each of the church years A-C. They are a good starting point when trying to formulate intercessions and set the mood. Celtic prayers are 'deceptively simple' and will not always suit a particular service (eg one from the BCP). Year A

Angela Ashwin's 'Book of a Thousand Prayers' is probably my most well-thumbed anthology. Although I very often change the wording, you are pretty hard to please if you cannot find the basis here of some useful prayers.