Barnes started her working life as a supply teacher, but decided to switch to a career in media, and held various posts including public relations officer for the
Royal Court Theatre in London and sub-editor on the magazine
Time Out, before moving into broadcasting, working for
Independent Radio News. She was one of the original news team members at the launch of radio station
LBC in 1973, and then worked as a reporter for
BBC Radio 4 for a year, before joining
ITN in 1975. During her time as an ITN reporter, she covered
the Troubles in Northern Ireland, the return of the Iranian spiritual leader
Ayatollah Khomeini in 1979, and the
Brixton riots in 1981. She made her name as a reporter with ITN on the lunchtime news in the late 1970s, but her first stint as a newscaster came in March 1980 when she began alternating with
Michael Nicholson as presenter on the
News at 5:45. Barnes was a regular
presenter on the
ITN Lunchtime News and ITN's weekend news bulletins from July 1985 until March 1989, and again between January 1991 and 1998. During the intervening period, she was the launch presenter of the
Channel 4 Daily breakfast programme. She regularly fronted the ITN flagship
News at Ten programme, as well as other current affairs programmes, and in 1994 was voted Newscaster of the Year at the TV and Radio Industries Club Awards. She left ITN in 1999, and then returned in 2003 to work on their short-lived 24-hour
ITV News Channel, until leaving again in 2004. Following her retirement from ITN in 1999, Barnes was a Dictionary Corner guest on the
Channel 4 quiz show
Countdown for the next couple of years, making 23 appearances on the programme until 2001. Between 1999 and 2001, she occasionally appeared as a relief newsreader on Channel 4's breakfast show
The Big Breakfast (the programme replaced
The Channel Four Daily, on which Barnes had appeared). ==Personal life==