A former Oxford University PhD student who was accused of raping a woman before texting to say sorry has walked free after a jury failed to reach verdict for a second time.

Statistician Sherman Ip, 25, was said to have forced the woman down on to his bed and pulled off her clothes before launching the attack on 14 May 2013.

But Ip told jurors "she consented" and says he thought "everything was normal" when they had sex at her parent's house the following day.

The woman, who cannot be identified, claimed she fled Ip's flat in tears after he forced her onto his bed, pulled her clothes off, and raped her.