If you are campaigning for or against one or more candidates at a Senedd by-election, you are covered by the rules for local campaigns.
Under the local campaign rules, there are limits on how much you can spend on campaigning for or against one or more individual candidates in a constituency.
These spending limits cover spending on most campaign activities, including leaflets, meetings and digital campaigning.
The Electoral Commission does not regulate local campaigning. Complaints about possible breaches should be made to the police.