When the filmmaker was a young man, he had made a summer visit to Broughton Castle.

Of course, he hadn’t noticed the swifts - but he will be given a second chance, courtesy of introductions made by the two Christophers.

Lord Saye & Sele and his son Martin Fiennes sit in ‘a room that hath no ears’ - and with the sound of swifts all around, enthuse about swifts.

Finally, pennies are dropping with the filmmaker: there’s a very special bond between swifter and swift.

Lord Saye & Sele and son Martin describe lives surrounded by swifts: