The Hereld Collection consists primarily of fanzines and examples of fan fiction by a number of authors, dealing with the British science fiction television series Blake's 7. There are also some items of fan fiction involving other genre shows, including The X-Files, Highlander: The Series, The Sentinel, and The Sandbaggers.

Most of the items are pieces of fan fiction. Fan fiction is defined as stories, novellas, novels, or poems written by fans about the characters, situations or general universe of the original work. Much of the fan fiction is of the "slash" variety. "Slash" refers to fan fiction that is sexually explicit, and same-sex in nature. In slash sex and sexuality are often the centers of the story, rather than the more conventional adventures featured in more traditional fan fiction.

In addition to the self-published fan materials, there is also a fairly long run of the more professionally produced Horizon, the official fan magazine of the Blake's 7 Apprecation Society. The collection also contains VHS videotapes, made by fans, of several fan-run (as opposed to professionally organized) conventions from 1988 through 1992 or 1993. Most of these conventions were Blake's 7-oriented. The tapes were made in order to provide a documentary record of the conventions and were available for sale to attendees or fans who could not attend.