How to sell a garden shed for a million pounds

A man wants to sell his decrepid old shed at the bottom of his garden.  He calls in an estate agent and tells him that he wants to list it for a million quid.  The estate agent realizes that this is a mad request and refuses to list the shed.

A week later, the man calls into the estate agent and tells him "I managed to sell my shed to my neighbour for my asking price of one million pounds".

"How did you manage that?" asks the extremely surprised estate agent.

"He gave me two gardening magazines worth half a million quid each".