Tis not Rocket Science old pal, but it does require something which on occasions is much more exacting, namely the application of common sense.
Some have it and some don`t, some will and some won`t. Some just join a website and expect it to provide all of the answers 80% of which are contained within the Owners Hxxxbxxk!
Salespeople, Receptionists, Mechanics, nor Technicians do not speak for Lexus.
Neither does L.O.C. as you rightly pointed out. Colin Barber, Steve 2006, et al, do their very best in offering advice and guidance which on occasions is perceived as being from within the Lexus Domain, but it aint.
Lexus U.K. speaks for Lexus and it has an official Website. Tis wise to read it and if in doubt refer to Lexus U.K. Head Office.
Lexus U.K. could have done much more to educate and train key people at each Lexus Franchise, this at least might have ensured a consistency in the delivery of a standard and scripted message.