James -
From conversations with members at Walton Heath, Woking and Sunningdale several years ago, I learned that those courses had undertaken 'heathering' programs. The programs, as I understand them, were necessitated because heather only grows in poor soils and, ironically, modern maintenance practices make for soils that are too healthy.
Apparently a good deal of heather has been lost over the last decades for that reason. To the extent it exists, it must be specially 'under-maintained' to survive. So I have my doubts about the Melvinesque
defense that 'it's just native vegetation'. As to first class modern golf courses in Surrey, it's perhaps less than clear.
If I misunderstood my hosts about the heather situation in Surrey, I am pleased to be corrected. Clear to me, however, is that the wonderful terrain, roughs, bunkers and greens of the great Surrey courses create, without more, memorable golfing challenges. Heather should no doubt be part of the mix. But only in moderation.
Bob