The original course was 7 holes around the Windmill played as three rounds making a 21 hole round. This continued until 1871 when Tom Dunn extended the course to 18 holes.
The course was described thus:
"So lately improved and extended as to make it one of the finest courses in the country, equal in extent and superior in the number and variety of hazards to the far famed Links of St Andrews."
This remained until 1901, when four new holes were constructed to replace those removed to make way for a larger public carpark area around the Windmill.
Tom Dunn remained with the club until 1881 when he moved back to North Berwick, whilst at the London Scottish he had apprenticed to him his younger brother 'Young' Willie Dunn who learned his golf on the Common.
'Willie' Dunn, later went on to win the first US Open, in 1894 a matchplay event at St Andrews, Yonkers, New York.