Tony, Sean and Rich
Thanks for the replies on this.
Rich if I can answer your comment first:
Troon - Mackenzie designed the New, later to be named Portland course there. I believe he designed at least a bunker on the 10th at the championship course, so him claiming "Troon" is certainly justifiable to an extent, although saying Troon Portland would have been full disclosure on his part.
Prestwick - Mackenzie claimed work at Prestwick in his 1923 and 1929 brochures and wrote of Prestwick in 'Spirit of St Andrews' (p91), "Some years ago I advised the Prestwick Club, who owned a magnificent piece of links land and had one of the most famous of the British Championship courses, regarding new 7th, 8th, 9th, 10th, 11th and 12th holes. The committee decided to carry out the work themselves. The general opinion of the club is that the changes have been a great improvement on the old holes, but I know, and doubtless other golf architects know, that they have made a complete mess of some marvellous natural golfing country. I was particularly distressed regarding the 11th hole. I visualised it as becoming the most famous of all one-shot holes, whereas the design and construction has been so badly carried out that it is a very indifferent hole."
But certainly a stretch to suggest he designed the course.
"Royal St George's - Mackenzie certainly undertook some remodelling work here. DSH list as a revision from 1925, as does C&W but with no date. Mackenzie in 'Spirit of St Andrews' (p123) says, "Royal St. George's in Sandwich, which we redesigned…." DSH think that the 9th green which was a new green moved back behind the existing was a Mackenzie design, as was probably the new 17th green, also moved back. Both these relocations were noted by Darwin (1925) but with no mention of the architect.
Again certainly a stretch to suggest he designed the course. Not a total lie, but not exactly full disclosure either.
In summary, Mackenzie could demonstrate an involvement with all these clubs, so why would Sunningdale be the odd one out. I'm willing to think he did have some involvement with Colt at S New.
Tony
I think Mackenzie's partnership with Colt and Alison began in 1919, shortly after the war had ended. By 1923 Mackenzie was announcing his own firm in a new brochure which stated that:
"The four years Agreement of Partnership between Messrs. Colt, Mackenzie & Alison having terminated, it has been decided that the conditions prevailing before the partnership shall be resumed."
From the sound of this the Agreement only ever had a 4 year lifespan - I suppose it could have been extended if all parties had wanted to, but clearly they didn't and I'm sure the decision not to extend was mutual.
Tony, I think you are right, the 7 year itch perhaps?