"It is without modern precedent for a prime minister to lose control of his foreign policy, let alone decisions about peace and war. That, though, is what has happened in the past 24 hours.
David Cameron summoned MPs to return early from their summer break in order to vote for British involvement in military strikes against Syria within days. The timetable was not his. It was President Obama's. Obama is said to have wanted to act before leaving the US for a foreign trip next Tuesday.
If he still wants to stick to that timetable, Britain will no longer be with him.
The government simply could not guarantee that its own MPs would give it a majority in the vote tonight. They needed Labour's support...
[Labour] are tabling an amendment which sets out what they call a "road map" to a decision - in effect a series of hurdles that have to be crossed before action can be taken.
The one that could prove trickiest is the one that may seem the easiest. It is the call for "compelling evidence" that chemical weapons were used by the Assad regime.
The UN weapons inspectors in Damascus will not produce that evidence."
http://www.bbc.co.uk/news/uk-politics-23879744