Ah, I see the problem. From the BBC website:
We are pleased to announce a new cutting-edge trial which will see all 29 of BBC One's World Cup matches available in Ultra HD and High Dynamic Range (HDR) on BBC iPlayer - but fans should grab their seats early as there is a limited number of spaces available (tens of thousands) for each game.
The Ultra HD stream will be available from the BBC iPlayer home screen as soon as programme coverage begins until the trial is full for that match.
Not a lot of cop then and forget the England games !