I think Tony Blair went straight from PMQ's to Buckingham Palace on his last day, so they can happen lunchtime/early afternoon. Perhaps not quite as early this time though as IIRC Her Majesty has an engagement in Cambridge in the morning
Here's the TV Forum thread from that day: http://tvforum.uk/thenewsroom/blair-leaving-brown-incoming-27-25482/
They cut Blair's speech at the end of PMQs short to go to Wimbledon.
Always interesting looking back at such threads and good to see that most of the problems identified there were not an issue today. Especially good to see the comparison in how ITV News treated events between then and now.
Have to laugh though at the criticism of the BBC cutting away from "the most iconic image was taking place, the one remembered by history". On the day something can seem to be so important but even without the recent Iraq Inquiry report Blairs exit speech was pretty much forgotten by history.
I preferred the internet when it had a sense of humour.