
Image from Wikimedia[1]
The tours are being organised by the National Gallery, which has strong links to the Longford Estate – I didn’t know this but the ‘Ambassadors’ painting by Holbein (the one with the skewed skull) is on loan from Longord. There’s more detail at:
Guided Tours of Longford Castle | What’s On | The National Gallery, London
I discovered this at the excellent Historic Landscape blog.