Bias on the BBC's Question Time, I am shocked

The Mail reveals that:

'The BBC has again been accused of political bias by ensuring Question Time has audiences ‘hostile’ to government cuts.

This week’s show was broadcast from the Labour stronghold of Middlesbrough, where 43 per cent of the workforce is employed in the public sector.

Many viewers were shocked at how much hostility was heaped on Philip Hammond, the Transport Secretary, during the show.

Next week the debate will be held in the Tory-free zone of Glasgow, while the following week it is due in Sheffield, where fury has raged since the election that an £80million government loan for a local steel plant, Sheffield Forgemasters, was cancelled by the Coalition.'

I recall reading on Biased-BBC a list of where Question Time had been broadcast from recently and there did seem to be a preponderance of Labour constituencies.

The part of The mail piece that really struck me was this:

'After the audience grilling, a BBC producer was overheard telling Sir Richard Dannatt, a panellist and the former head of the Army, that the show was held in Middlesbrough because the audience would be the most hostile to the cuts.'

If true this is a) unsurprising to those such as me but b) surely ground for the government imposing sanctions on the BBC. I note also that the Green's first MP has been a guest yet again, why so often?