A post-mortem examination on Natasha Collins - the fiancee of BBC childrens’ presenter Mark Speight - was "inconclusive", police have confirmed.

Further toxicology tests will now be carried out on the 31-year-old actress's body to determine the cause of death.

Speight was arrested on Thursday on suspicion of murder and supplying cocaine, after Collins’ was found dead in the couple's flat in St John's Wood, north London.

He has been bailed until the first week of February. 

It was reported that the TV presenter had taken cocaine before her death.

However, Speight's mother, Jacqueline, speculated that Collins may have died after taking drugs prescribed for a medical condition.