Sean,
Bravo, it's all starting too make some sense. However it would be nice to put names to a couple of unexplained changes.
I've added some comments to your summary:
1. This is largely Colt. Rerouted and new green 1923. Gibson tee 1891.
2. Colt 1923
3. Colt 1923, used existing 4th layed out by Taylor & tweaked by Fowler.
4. Colt 1938
5. Colt 1923
6. Hawtree green 1976 and a few years ago. Pennick tee 1978.No mention of Pennink, probably a Hawtree tee
7. ? Hawtree or Pennick 1976 or 1978, not clear.Part of report with the 8th green by Alison, no recent report of either Pennink or Hawtree working on the 7th (maybe Hawtree with 6th green). Must give credit to Alison unless otherwise proven.
8. Alison green 1953. Pennick or Hawtree 1976 or 1978, tee and routing not clear.
9. Colt 1923
10. Colt 1923
11. Colt green 1923. Hawtree or Pennick 1976 oer 1978, not clear.
12. Pennick 1978
13. Pennick 1978. Looks like a new green has been built since. Not surprised, because there is an odd bunker about about 50 yards short of green where old green probably was.
14. Remains a mystery to me. I can't see how the old 13th green was used. According to diagrams, it can't be. The old 13th and present 14th are on separate sides of a large hollow. The would be old 13th referred to must have been built after 1938. Anybody have further clues to this hole?
The description given is taken from Hawtree's report. Given today's layout, Pennink must have decided otherwise, therefore let's assume its Pennink.
15. Fowler green 1910. Taylor routing 1901. Pennick tee 1978.
16. Colt (Dr. Mac ?) green 1923. Gibson and Taylor routing, 1891 and 1901. Fowler tee 1910.
17. Colt 1938.
18. Gibson green 1891. Fowler tee 1910.
Alison's forty year membership at the club until his death in 1954 suggests he was responsable for undocumented minor changes.
It would be nice to check this with someone at the club, Tony Hill or other family's who stretch back several generations at the club. What do you think ?