He has been chair of bitC since January 2002 and also served as CEO of BG Group during the Lattice demerger.
Varney will speak on the first evening of the Forum, which will be held at The Oxford Belfry from 24 to 26 November.
Frank Kane, The Observer business editor, is another confirmed speaker at the Forum, which aims to bring together senior in-house staff and potential service suppliers .
Workshops will be medi-ated by British Airways head of comms Iain Burns, Citigate Dewe Rogerson director Tony Carlisle, Greenpeace campaign director Blake Lee Harwood and Edelman crisis and issues director Mike Seymour.
Anyone wishing to attend this year’s PRWeek Forum as a delegate should contact Anna Campbell, Haymarket events manager, on 020 8267 4225. Exhibitors should contact Andy Gallacher on 020 8267 4372.