The earliest you can officially become a candidate is on the last date for publishing the notice of election, which is 25 working days before the poll.
You will officially become a candidate on this day if, on or before this date, you have already declared yourself a candidate at the election (or another person has declared that you are a candidate).
If, after this date, you or others declare that you will be a candidate at the election, you will become a candidate on the date such a declaration is made, or on the date that you submit your nomination papers, whichever is earlier.
The day after the date you officially become a candidate, spending rules will apply.