In The Man With The Golden Gun, Bond seems to have a preference for this now-defunct brand.
After arriving in Jamaica, Bond makes his way to the hotel at Morgan’s Harbour. While waiting to meet up with Mary Goodnight, he goes to the waterfront bar and orders a “double Walker’s de Luxe on the rocks” followed by another “with a water chaser to break it down”. Then, when Goodnight arrives, he orders her a daiquiri, and himself another double, making it three doubles at that sitting.
Later, after checking into the Thunderbird hotel, Bond calls Room Service and “ordered a bottle of Walker’s de Luxe Bourbon, three glasses, ice and for nine o’clock, Eggs Benedict.“
The best drink of the day is just before the first one (the Red Stripe didn’t count). James Bond put ice in the glass and three fingers of the bourbon and swilled it round the glass to cool it and break it down with the ice.
After picking up his book, (Profiles in Courage by John F Kennedy.) Bond drinks:
He drank the bourbon down in two long draughts and felt its friendly bite at the back of his throat and in his stomach. He filled up his glass again, this time with more ice to make it a weaker drink, and sat back and thought about Scaramanga.
He then has a last drink before bed.
Two more times in the book, Bond takes a slug or two of bourbon in his room. We can assume it is from that same bottle.