A 3-0 defeat at Rectory Meadow meant Villa dropped to seventh following a third straight loss.
Ben Mulley was sent off in the 61st minute with the scores level at 1-1.
Villa fall to sixth after promotion rivals Uxbridge and Hartley Wintney pick up huge wins.
Goals from Sam Merson and Sam Mead gave Villa our fifth straight league win.
A superb second-half strike from George Wells gave Farnham Town their first home defeat of the season.
For more than 40 years, Harrow Borough piled their trade in the seventh tier of English football. But after a torrid 2023/24 season in the Southern League Premier South led…