A third party must have been involved in putting MI6 officer Gareth Williams in the padlocked bag in which his body was found, an expert witness believes.

Peter Faulding told Mr Williams's inquest he would have been dead within 30 minutes of being put in the holdall.

The body of Mr Williams, from Anglesey, was found in his London flat in 2010.

The inquest was shown footage of two experts' attempts in which they struggled to lock themselves in a bag - but neither ruled it out completely.

Gordon Corera reports.