Here is a different angle on Prestwick in 1947:
Northumberland, Newcastle racecourse, cue Mark Pearce
Longley Park, Huddersfield, 1926
Ballater 1948
Balmoral. 1948. Looking on Google Earth it appears to be in good health today. But it’s not listed in R and A handbook (but not everything is). The only Royal course listed is the Royal Household at Windsor Castle.
Next I'll deal with those omissions pointed out in the 4 Omissions thread.