Britain it seems oversaw the sale of chemicals to Syria that were eventually used in the manufacture of the deadly nerve agent Sarin.
Sarin is 20 times more deadly than cyanide. A drop the size of a pin-head can kill a person. It is often called a "poor man's atomic bomb" and kills by crippling the nervous system.
Documents from the Foreign Office suggest chemicals and components were supplied to Syria in the mid-1980s.
A report by UN chemical weapons inspectors found "clear and convincing evidence" that rockets containing sarin were fired at suburbs near the capital Damascus last August in an attack that killed hundreds of people.
Earlier, it had emerged that the UK government authorised the export of two chemicals to Syria last year that can be used to make the nerve agent Sarin.
The licences were to export potassium fluoride and sodium fluoride, which can both be used as precursor chemicals in the manufacture of nerve gas.
US Secretary of State John Kerry had earlier confirmed that Sarin has been used on rebels by the ruling regime in Damascus. The Department for Business, Innovation and Skills have however insisted that although the licences were granted to an unnamed UK chemical company in January 2012, the substances were not sent to Syria before the permits were eventually revoked last July following tightened European Union sanctions.
Business secretary Vince Cable was asked by MPs to explain why a British company was granted export licences for the dual-use substances for six months in 2012 while Syria's civil war was raging and concern was rife that the regime could use chemical weapons on its own people.
Labour MP Thomas Docherty who is presently a member of the Commons Arms Export Controls Committee will table parliamentary questions demanding to know why the licences were granted and to whom.
The licences for the two chemicals were granted on 17 and 18 January last year for "use in industrial processes".
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