A Bollywood film worker and his 'beautiful' partner died at their west London home after taking a 'mystery green pill' that may have contained a synthetic drug hundreds of times stronger than heroin, it was revealed today.

The couple, named locally as Gagan Brar and Kamaldeep Kaur, were found unresponsive in their bedroom by their flatmates at their flat in Havelock Road, Southall, on May 26.

It is believed the couple obtained the blue-green pills while out clubbing with their flatmates the previous night.

It is not yet known confirmed exactly what the pills contained, but warnings circulated by local alcohol and drugs services state they are feared to be nitazenes, a synthetic opioid that can be up to 500 times as strong as heroin.

Mr Brar, 28, originally from India, was a driver for celebrities in the Bollywood film industry who visited London.