David Cameron is resolute a "robust response" to Bashar Assad's use of chemical weapons in Syria is needed – despite British military involvement being ruled out.

Meanwhile, the Prime Minister has also declared Britain "will always stand up for Gibraltar" during talks with Fabian Picardo, its chief minister, at Downing Street.

And, material seized from the partner of Guardian journalist Glenn Greenwald would harm national security if disclosed, the High Court has heard.