BBC's balanced welfare coverage

Looking at how the BBC has reported reaction to Iain Duncan Smith's welfare initiative:
http://www.bbc.co.uk/news/uk-politics-10807098

We're given reactions (both positive and negative) from only the following:

• Will Hutton (left-wing)
• Yvette Cooper (left-wing), speaking on behalf of Labour (left-wing)
• SNP (left-wing)
• Plaid Cymru (left-wing)
• Brendan Barber (left-wing) speaking for the TUC (left-wing)
• And a spokeswoman for the IPPR, which the BBC itself describes as "left-leaning".

Well if that's not what I call balance across the whole of the left-wing spectrum, I don't know what is! However, if we are to believe the BBC, nobody from the centre or the right of British politics has an opinion on this.