Marvel Studios has apparently shifted Avengers: Endgame's release date forward a day in the United Kingdom and Ireland to April 25, according to the box office statistics company ComScore.
NEWS FROM THE UK & IRELAND RELEASE CALENDAR:— Comscore Movies UK & Ireland (@cSMoviesUK) January 29, 2019
Avengers: Endgame will have a Thursday opening, 25th April.
Meanwhile, the U.S. and most other major territories will first get the movie on April 26 (with the Thursday evening 'preview screenings' taking place on April 25 of course).
2018's Avengers: Infinity War was similarly moved up for U.K. and Ireland theaters before its release.