The New Murrey and Blue blog

… is the Water End Barn, now the city‘s JD Wetherspoon but originally the property of Sir John Jennings.

Sarah Jennings, his granddaughter and later the favourite of Queen Anne, married John Churchill in secret (which nobody else ever did, of course) and they became the first Duke and Duchess of Marlborough. As you can see from her Wikipaedia page, their first surviving child Henrietta is the most recent common ancestor of Earl Spencer and of Sir Winston Churchill, John’s great-grandfathers including Sir Henry Winston.