Inspired by this market: https://manifold.markets/Nico/will-the-party-endorsed-by-the-sun
As in the above market, endorsement will be determined by the equivalent of this page: https://en.wikipedia.org/wiki/Endorsements_in_the_2019_United_Kingdom_general_election
For context, the Sun is a popular British newspaper. It is generally considered to be right-wing, and it has supported the Conservatives more often than not, but it endorsed Labour at the 1997, 2001, and 2005 elections.
Murdoch's Sun newspaper backs Labour in UK election - https://www.reuters.com/world/uk/uks-sun-newspaper-backs-labour-one-day-before-election-2024-07-03/
Labour endorsement registered below:
https://en.m.wikipedia.org/wiki/Endorsements_in_the_2024_United_Kingdom_general_election
The telegraph has endorsed the conservatives, and the mirror, Labour. No surprises there probably
https://en.m.wikipedia.org/wiki/Endorsements_in_the_2024_United_Kingdom_general_election