Andy Burnham becomes an MP by June 30?

This market will resolve to “Yes” if Andy Burnham officially assumes the position of Member of Parliament for any seat in the United Kingdom House of Commons by the specified date, 11:59 PM ET. Otherwise, this market will resolve to “No”. The primary resolution sources for this market will be official information from Andy Burnham and the government of the United Kingdom; however, a consensus of credible reporting may also be used.

Source: official resolution criteria from Polymarket. Always verify on the source page before trading.