Shivas,
I don't know the answer to that. There are one or two, of course, who do know their course in such detail - Nick Leefe at Alwoodley for one. He was the one who pointed me to this site. But, then, Alwoodley is hardly different now from 1907. The only significant changes (#10 & #11) were suggested by Mackenzie in a drawing of about 1910. Nick has been removing unnecessary trees to restore the heathland/moorland feel and, most importantly, Mackenzie's sight-lines.
I wonder if it may be a deep-rooted problem? We had that so-called Golden Age Colt, Mackenzie, Abercromby, Hawtree Snr etc which lasted until WWII. If you wanted to tinker with your existing course you called in one of them and a great deal of their work was exactly of this kind. My local course, Wilmslow, moved to its present site in 1903. Since then Sandy Herd, James Braid, Tom Simpson, George Duncan and Fred Hawtree made alterations before WWII. After that further amendments were made by Cotton/Pennink/Lawrie and, most recently, David Thomas. There are a great many courses around here of a similar age and with a similar hotch-poych of architecture. I don't want to be rude about Wilmslow, I love playing there and never turn down an invitation. It's beautifully maintained and gives the best winter golf in the area, but you would be hard put to remember the architecture after playing it.
Some of the problem, I suspect, lies within the club management structure. A captain - effectively Chief Executive - is in office for only a year. He wants the least angst during that year. He's not in office long enough to do anything serious. The Chairman of the Green may hold his office for several years. After two or three years in office everyone bows to his superior knowledge and his decisions are merely rubber-stamped. That can be the only explanation for some of the abominable bunkers, green shapes (I can't think of the opposite of a complex!), boring teeing grounds and so on that currently do service on what are apparently the work of a well-respected designer.
For instance, a local club, Hazel Grove, had a pleasant Mackenzie layout which was threatened by a proposed motorway link to Manchester Airport. They took the bull by the horns and obliterated the holes that lay on the proposed route and called in Tom Macauley the Irish architect to build some new ones. It ought to be easy to tell the Mackenzie survivors from Macauley's new ones. It's easy enough to identify Macauley's holes, but I should be very wary about saying how much Mackenzie survives on the other holes - they simply don't have enough character. There's a similar situation at Didsbury, another Doctor's examination cut by a motorway, with new holes by Peter Alliss and Dave Thomas. Again, it's hard to believe that the surviving holes are Mac's because (in comparison with his other courses in the area, especially Cavendish and Reddish Vale) they are remarkably unmemorable.
Another local course with which I am very familiar, having been a 5-day member there for some years, is Bramall Park. It's a 19th-century club which called in Mackenzie to extend the course to 18 holes in 1922. In 1934 the club brought in James Braid to modify the course because the members found it 'unsatisfactory'! He is said to have tamed the greens and bunkers and added a few more bunkers. I don't think you could find less penal bunkers in the land! Of course, a lot of this is down to maintenance costs with the effects of the general depression, WWII and budgetary restrictions ever since. Funnily enough, I spoke to the Secretary at Bramall Park only the other day to ask if there were any records to show what Mackenzie's course was like and what specific changes Braid had made. He told me that there were no records in the club, though they may survive in someone's home. I suppose that by the time Braid came on the scene Mackenzie was a forgotten man in the UK (if he was ever famous as such here) and nobody really cared about his design as long as they got a course more suited to the general standard of play.
I correspond with Paul Turner occasionally about Colt courses. Invariably he asks me how much original Colt survives. I never know the answer and I suspect it would take a lot of interrogation before I found anyone who could say for certain at a great many clubs.
As you know I write golf guides. These are not architectural treatises; they are a means to enable visiting golfers to find whatever kind of course they seek to suit there own tastes. That is why you will find The Belfry, Celtic Manor, The Oxfordshire and so on given just as much prominence as Sunningdale or TOC. But I was in discussion with a publisher a year or two back who produces beautiful books on contemporary design - art, architecture, and so on. He saw a fit with golf course design and we put together a few sample pages which were, if I may be so bold as to say, ravishing. It was shown at the Frankfurt Book Fair. There was absolutely no interest in the UK or Europe. At that same Fair I had done a mock-up for another publisher on a book of golf tips. It was snapped up. (I didn't write the book as I know nothing about teaching golf). A glance at the golf shelves in any British bookshop will reveal endless books about the stars and, especially, tuition. Several golf magazines here almost never carry anything architectural. True, they will feature certain courses, but it's a travel thing, not an architectural exposition.
Sorry to write at such great length. All I can say is a big thank you to so many Americans who know a great deal more about our British courses than we do and are in themselves walking reference books! And didn't it take an Australian, Paul Daley, to capture the essentials of links golf in his excellent book?