Chief Inspector Vince Esposito gave evidence today. He said he'd believed "without a shadow of doubt" that De Menezes was Hussain Osman, reports the Guardian.
Update, 20.22: Commenter kipppers (see below) craved more detail from the inquest. Thanks to blogger and campaigner Charlie Pottins - who's been attending the inquest - I've belatedly discovered an official transcript site, which includes a line-by-line account of today's proceedings (pdf).