The BBC's Henry Zeffman and Nick Eardley on the mood in government as speculation grows about the prime minister's departure.
A Met Office amber weather warning for heat comes into force on Monday and will now last through to Thursday.
The Princess of Wales and the couple's children share message for "the best papa in the world".
Police say 28 people remain in hospital after two trains collided on Friday.
A selection of images from across the UK to mark the longest day of the year.