A worker with a grievance against his supervisor took inspiration from the “Unsolved Crimes” TV programme to import poison and apply it to the handle of the boss’s car, confiding in colleagues that it would kill him within 24 hours.

DNA results, due this week, could provide a major breakthrough in the investigation into the brutal murder of teenager Anastesia Kriegel.

Concerns have been expressed for the timeframe for the provision of a new forensic science laboratory after the Government confirmed tenders for its construction had been deferred.