Guest director, Michael Rosen, will be in conversation with journalist Polly Toynbee about his role in this year's event.
It's also expected that the entire programme of events will be revealed in advance for the first time.
More top news
A slice of the Queen and Prince Philip's wedding cake has sold for £500 at auction in Sussex, 68 years after the Royal couple got married
The sun shines on day one of the Great Dorset Steam Fair where 200,000 engine enthusiasts are expected over the next five days.
Simon's Blog - Unusual Harvest