Mr Lightman agreed there was a danger that some qualifications might be seen as better than others.
There was a danger, he said, in building big estates to house large concentrations of disadvantaged people together.
Whitaker, also speaking at the forum, said there was a danger tracks like Silverstone would get left behind.
Mr Grimes argued that there was a danger in being seduced by the idea of "clusters" of cases.
Recent reviews of the science had not shown there was a danger to health from using mobile phones, he said.
Margaret Hodge told the BBC that there was a danger corporation tax was becoming "voluntary" and that this had to change.
He said there was a danger that saving the euro might be a case of "saving the cancer, not the patient".
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The councillor said there was a danger senior officers' pay "may be spiralling upwards due to competition by 22 local authorities".
In the absence of a full independent public inquiry, there was a danger that these questions would go unanswered, Mr Ainsworth said.
He wondered if there was a danger the plan could be "the HS2 of cycling", with better value being delivered by smaller schemes.
Earlier this week Cleveland's chief prosecutor, Martin Goldman, said there was a danger of the new law jeopardising confidence in the justice system.
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She said PCSOs on the whole have done a very good job and there was a danger of "one bad apple" tainting the rest.
David Macdermid, of Tennis Scotland, said there was a danger that a lack of facilities could inhibit the benefits of the "Andy Murray" effect.
Lord Justice Leveson said that "there was a danger of trial by Twitter" and other forms of social media and it would "take time to civilise the internet".
He also said that there was a danger that many people would think that any message telling them that they had an infection on their machine was a scam.
On Wednesday, Mr Blunkett admitted there was a danger of children with special educational needs not getting the same access to the national curriculum as their peers without special needs.
And so there was a danger for Barack Obama of looking unresponsive, of staying too much on the sidelines, at a time when the public was demanding a more activist approach.
"Missiles do not destroy regimes", he told MPs, saying there was a danger of a stalemate and there "was no enthusiasm in the country for a third conflict in the Muslim world".
Tory leader David Cameron said there was a danger the public would believe the process had been "fixed to make sure the government avoids having to face up to any inconvenient conclusions".
Some large stores had begun testing the market in recent years and there was a danger of a "domino effect" with others following suit in the face of competitive pressures, he said.
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There was a danger that the militants would have seized control of Bamako and the southern Malian heartland before any of the European military trainers or the West African intervention forces had arrived.
Having noticed adverts becoming more prominent in both the new newsfeed and in Facebook's various mobile apps, I wanted to know whether Ms Sandberg thought there was a danger of users reaching saturation point.
However he warned that there was a danger that some schools might decide to enter pupils for four of the new AS-level exams in Year 12, followed by three full A-levels in Year 13.
Prosecutor Anne Toohey had previously argued that there was a danger Mr Dotcom would try to flee the country, citing his multiple passports, financial resources and previous criminal convictions for hacking and insider trading.
But UK Independence Party Treasurer Stuart Wheeler, who gave evidence to the inquiry, said there was a danger a "political cartel" would be created - particularly if parties like UKIP were excluded from the taxpayer-funded support.
Mr Price added that people came to Cornwall for the beaches and the rugged coastline but there was a danger its beaches would turn into a "number of European ones" with buildings and retail outlets in close proximity.
Dr Matthew Goodwin, an expert on right wing extremists at the University of Nottingham who gave evidence to the committee, told the Today programme that there was a danger different extremist groups could end up engaging in violent clashes.
For one there was a warning from critical care specialist Dr Peter Matthews that - to put it bluntly - there was a danger much needed beds in intensive care units would end up being used for the purposes of harvesting organs.
And I thought that there was a good chance that there was, you know, in the most significant cultural city in this country, there was a danger of some really vital stuff being lost, and I didn't hear people talking about that.
As a result, he added that there was a danger that the Italian economy would be burdened by extremely high levels of taxation for many years to come, which would dampen future economic growth, making it difficult to pay down the government debt.
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