I have just found out that it is possible to get RadCom as a PDF from the RSGB website. You can download the entire magazine in a single PDF (or smaller articles individually) from http://www.rsgb.org/radcom
Full magazines are available from January 2010 whilst it is possible to download PDF articles from as far back as November 2008.
The Radio Society of Great Britain Members’ magazine is sent free every month to Members of the Radio Society of Great Britain. It has the largest amateur radio readership in the UK and is respected throughout the World.