Williamson teams up with Chambers for Valencia

The European Under-23 100metres champion will fill the second slot in the 60m alongside Chambers who was automatically selected - against UK Athletics' wishes - after winning the trials earlier this month.

This year the 22-year-old has lowered his personal best to 6.60seconds before finishing second behind Chambers in Sheffield but ahead of European Indoor silver medallist Craig Pickering.

Pickering was expected to be Chambers' main challenger but the he ended up trailing in fifth.

Pickering and Williamson were then set to go head-to-head at the Norwich Union Grand Prix in Birmingham the following weekend but the former pulled out with a virus, and a damaged hamstring meant the former European 100m junior champion then abandoned his indoor season altogether.

It is third time lucky for the Highgate Harrier who had finished one position outside qualification for major indoor competitions in the last two years and who could consider himself unfortunate not to have travelled to the world championships in Osaka last year as part of the relay squad.

Many British athletes support Chambers' inclusion in the team but refuse to comment publicly and there was widespread backing for the former world junior record holder among the Sheffield crowd.

Williamson was also supportive and said in Sheffield: "Dwain has done his time and I have no problem with him running."

Rikki Fifton of Victoria Park & Tower Hamlets, will travel as a reserve. Further additions to the GB&NI squad include European 5,000m silver medallist Mo Farah and Nick McCormick in the 3,000m.

Former Commonwealth champion Michael East will join James McIlroy in the 1,500m while James Brewer will travel as a reserve.

Damien Moss takes the second spot in the 800m although there is no place for European bronze medallist Sam Ellis.

Richard Buck and Steve Green - already selected for the individual 400m - will be joined in the 4x400m squad by European indoor silver medallist Robert Tobin, Nick Leavey, Dale Garland and Debo Ademuyewo.

Lisa Dobriskey will join previously selected Helen Clitheroe in the line-up for the 3,000m while Montell Douglas has been named as reserve in the women's 60m.

The Great Britain & Northern Ireland team for the World Indoor Championships in Valencia next month is as follows:

Men

60m Dwain Chambers (Belgrave Harriers); Simeon Williamson (Shaftesbury Barnet Harriers); reserve - Rikki Fifton (Victoria Park & Tower Hamlets).

400m Richard Buck (City of York); Steve Green (Newham & Essex Beagles).

800m Richard Hill (Notts AC); Damien Moss (Rugby & Northampton AC).

1,500m James McIlroy (WSE Hounslow); Michael East (Newham and Essex Beagles); reserve - James Brewer (Cheltenham & C Harriers).

3,000m Mo Farah (Newham and Essex Beagles); Nick McCormick (Morpeth Harriers & AC).

60m hurdles Allan Scott (Shaftesbury Barnet).

High jump Samson Oni (Belgrave Harriers).

Pole vault Steve Lewis (Newham & Essex Beagles).

Long jump Chris Tomlinson (Newham & Essex Beagles).

Shot putt Carl Myerscough (Blackpool).

Triple jump Phillips Idowu (Belgrave Harriers).

4x400m relay Buck, Green, Rob Tobin, Nick Leavey, Debo Ademuyewo, Dale Garland

Women

60m: Laura Turner (Harrow AC); Jeanette Kwakye (Woodford Green & Essex Ladies); reserve - Montell Douglas (Blackheath & Bromley Harriers AC).

800m: Jenny Meadows (Wigan & District Harriers); Marilyn Okoro (Shaftesbury Barnet).

1,500m: Jemma Simpson (Newquay & Par); Susan Scott (City of Glasgow).

3,000m: Helen Clitheroe (Preston Harriers); Lisa Dobriskey (Ashford AC).

60m hurdles: Sarah Claxton (Woodford Green & Essex Ladies).

Pole vault: Kate Dennison (Sale Harriers Manchester).

Pentathlon: Kelly Sotherton (Birchfield Harriers).