Under co-option, parties can fill vacancies in the assembly and councils without holding a by-election.

The Electoral Commission says it is conducting a survey into intimidation faced by campaigners.

Everyone voting in person at the general election on 4 July will have to show valid photo ID.

People are also reminded to bring valid photo ID to their polling station when voting gets under way on Thursday.

Just over 2.1 million people have registered since the election was called, latest data shows.

One non-binary 18-year-old said they bought a new passport as they did not know of a free option.

Experts consider when UK voters might be permitted to vote in elections online.

Beijing tells the US and UK to stop their own cyber attacks, accusing them of "political manipulation".