Harry Vardon was not a prolific architect. His course at Woodhall Spa was redesigned by Hotchkin. He did some early work at Ganton. How much of this survives I cannot say. His last years were spent at South Herts and today's course is much of his making - not a very memorable course, I'm afraid. Probably his most interesting layout is Sandy Lodge, although he was working to a formidable brief by the club's founder, Markes, who clearly told him precisely what he wanted, and where. I have always liked and enjoyed Little Aston, but it doesn't get much acclaim on this site. I can't say that I see a particular style emerging from the three Vardon courses I know best, Little Aston, Sandy Lodge and South Herts. Not much use to you, I'm afraid.