Guilding's major publication was The Fourth Gospel and Jewish Worship (Oxford: Clarendon, 1960). Unlike Goulder, Guilding thought that there was a triennial lectionary cycle in the first century, and she mapped correspondences between John and the hypothetical cycle in great detail. Although she failed in the long term to convince the academy, the literature is littered with references to her discussions of interesting parallels that do shed light on John. Raymond Brown, for example, often referred to Guilding in his commentary on the Fourth Gospel.
My own interest in Guilding's work came through my research on lectionary theories of Gospel origins, on which I wrote my MPhil dissertation at the University of Oxford in 1990, under the direction of John Ashton and Ed Sanders. I devoted Chapter 6 of the dissertation to a test of one of Guilding's theories and found it wanting in that randomly chosen parallels in sequence within John generated as many parallels as Guilding's sequence.
Guilding was professor of Biblical Studies at the University of Sheffield, and an interesting article by David Clines fills in some of the details of her career there:
The Sheffield Department of Biblical Studies: An Intellectual Biography
David J. A. Clines
The article reveals that Guilding was appointed at Sheffield by F. F. Bruce, the department's first professor:
Aileen Guilding, who had studied at Oxford, carried on Bruce’s tradition of precise textual scholarship,13 but with an added flair for the grand ingenious theory. She looked in others for what she called ‘top spin’ (was it a cricketing or a tennis metaphor?), and she had it herself. She was known for her hugely learned theory that John’s Gospel had been composed to follow the sequence of a Jewish lectionary of the Pentateuch, and showed in her The Fourth Gospel and Jewish Worship1 an intimate knowledge of the sources, rabbinic and Septuagintal as well as the two Testaments. Her theory found no following, as far as I know, but the scholarship itself was massive and impeccable . . . .I recall it being said that Guilding was the first female professor of New Testament anywhere in the UK.
. . . . Alan Dunstone, who had worked in New Testament and published in patristics was to leave in 1964 for a position in theological education in Papua–New Guinea. Guilding was authorized not only to replace him but to make an additional appointment in Old Testament.
The result was that David Hill and I were appointed by Aileen Guilding in the same month of 1964, no doubt primarily for our linguistic promise—for she told us that we would be of no real use to her until we had served five years . . .
. . . . In September 1965 Aileen Guilding retired prematurely from the Department, and the Department went through a period of uncertainty . . . .