Sneaky's Daily Did You Know....? - Barking Mad

Terrified of meeting people, the 5th Duke of Portland built an elaborate network of tunnels beneath Welbeck Abbey in Nottinghamshire through which his carriage could pass in secret. So that he wouldn't have to talk to anybody, each door in his house was fitted with two letterboxes - one for incoming and one for outgoing messages. Only his valet was allowed near him. In the event of illness, the Duke's physician had to wait outside while the valet took his masters pulse.