No one's going to report it though, because doing that doesn't absolve them of culpability. They can still get charged for it because the offence is absolute - all it takes is receiving a dodgy image, whether solicited or not, whether they retain it or delete it immediately, none of that matters.
HE's barrister said in mitigation that Huw had deleted the images and told the sender not to send him anything illegal. Since he's pleaded guilty those claims will never be tried in court.