Sue:

If you are wanting to investigate Church of England churches that allow their facilities to be used for concerts, one place to start would be with the diocesan offices. The Church of England is divided into forty-four separate dioceses (the singular is 'diocese'). You can find a list of them with links to their web pages on this page. Clicking on the link for an individual diocese will lead you eventually to its web page, where you will usually find contact information for the diocesan office.

Tim