Rupert Murdoch will be enjoying the hunt for 21st Century Fox

Rupert Murdoch has been lucky – or, more likely, skilful in his timing.To understand quite how far Comcast is pushing out the boat, look at how much debt the owner of NBCUniversal is prepared to shoulder to get the Fox assets.If the separate offer for Sky in the UK were also to succeed, Comcast would have borrowings of roughly $165bn, an astonishing sum even in a US media market driven to panic by the rise of Netflix.