I've always liked old clubhouses so I tried to find the most historic clubhouse, or at least some of the oldest (with little known courses, in the main):
Woodsome Hall main structure built in 1517, although some dwellers there since 1089:
Clubhouse at Chislehurst, 1717
Rotherham, the estate goes way back to before 1066, althoug the clubhouse is from 1814.
This one a Farnham isn't very grand, but does goes back to the 1700s and looks like a fine country pub!
Effingham from 1770, but with a fireplace made from ship limbs from the Spanish Armada.
Kings Norton, not sure how old this one is but it's pretty impressive!