The End of Empire

From the NYT: "Seeking a Willing Heir, an Aristocrat Turns to America"

Sir Benjamin, who has a head of snowy hair and a prosperous-looking, ruddy complexion, was not supposed to inherit the baronetcy or Maunsel House, which belonged to his uncle. [...] When he took possession of Maunsel House, it was a ruin, his surviving aunt confined to just two rooms.

"She lived on Mars bars and Milky Ways," he said. "She drank for Somerset. She had about 18 different driving offenses — hit and run, driving over a policeman's foot. When she died, she left £22.50, and she didn't leave it to me." Once, Sir Benjamin said, the aunt set the house on fire, hoping to collect insurance, only to have the fire fizzle out because of the pervasive dampness.

I love this story, but "she drank for Somerset"? I can find no other examples of this phrase in any form, anywhere.