On the About page, click Instructions to authors in the right margin. Scroll down the page to PREPARATION AND SUBMISSION OF THE MANUSCRIPT, where you'll find the following:
Papers must be clearly written in English. The text should be
presented on A4 or an equivalent size. Please submit your manuscript
in Computer Journal format using the LaTeX document preparation system
in conjunction with the comjnl.cls file. If this is not possible then
please ensure that the manuscript is in single-column format and
double line-spaced. Margins of at least 25 mm should be left around
all sides of the text. Please number each page but provide a short
running title on the title page only. Ensure that any unusual symbols
or letters are clearly identifiable. Manuscripts submitted in other
journal styles may be returned to you for re-formatting.
The manuscript should contain the following information: the full and
a short title, and a complete list of authors, their affiliations and
addresses; the main text; all figures and tables, and references. The
corresponding author should be identified along with both his/her
postal and e-mail addresses, and telephone and fax numbers.
So you want to download this:
This ZIP file contains the document class written for the journal (comjnl.cls), a BibTeX style file (comjnl.bst) and an example .tex file, sample.tex.
