Dr Mackenzie designed a new course for the Hadley Wood Golf Club in London that opened in 1922. Here's a little of what we know about the course:
Doak Scott Haddock list as new course by Mackenzie from 1921. Hawtree and C&W both list it as new course from 1922, while club website says course opened in 1922. Listed in Mackenzie's 1923 brochure/advertisement. Article from the Barnet Press of 2 June 1922 says that the course was officially opened on Saturday 27 May 1922. "Dr. A. Mackenzie (architect of the golf course)" was amongst the list of those present at the official opening which included an exhibition match between George Duncan & W. B. Smith vs Harry Vardon and Ted Ray. Article indicates that Mr. Harris was the contractor who constructed the course. The Times reported on the opening in its issue of May 29 1922, saying that, "The course, which has been laid out by Dr. A. Mackenzie, of Messrs. Colt, Mackenzie, and Alison, is about 6,500 yards in length, and provides a fine test of golf."
This looks like another Mackenzie course that was constructed by Franks Harris, and another Mac course while the partnership with Colt and Alison was still in effect, that was located in Colt's backyard.
I recently came across these 6 postcards for sale from around 1930 depicting different holes at Hadley Wood, unfortunately I missed out on them at auction, so I only have these low resolution images. Still, better than nothing. They give a good idea of Mackenzie's new course work from this immediate post war period. I've looked at a routing map of the current course and it would seem the course has been renumbered since then - perhaps other GCAers can help determine which holes these are today. I'd also be interested to hear from those who have played the course. The postcards are of holes 6, 8, 11, 13, 14 and 17.