Check out the post at 18:40 ......
Sky News understands polling station staff were forced to turn the former prime minister away after he initially failed to comply with legislation he introduced while he was in Downing Street.
Mr Johnson, who introduced the Elections Act requiring photo ID in 2022, was attempting to cast his ballot in South Oxfordshire, where a police and crime commissioner for the Thames Valley is being selected.
Boris Johnson introduced the Elections Act himself
In England, passports, driving licences, blue badges and certain local travel cards are accepted forms of voter ID.
A spokesman for Mr Johnson did not deny he had failed to bring ID, but did say he'd managed to vote today.
Make sure you don't make the same mistake if you haven't voted yet - we've got a full list of acceptable ID in this post.
If only Mr Johnson had checked the Politics Hub before he went out...