The Bond family motto is mentioned in On Her Majesty's Secret Service (movie).
I'm slowly working my way through Bond 50 on Blu-Ray and I just watched OHMSS (on of my favourite books and a pretty good movie too).
I agree that On Her Majesty's Secret Service is a good book and one of the better films.
I have one more Bond to go and then I've seen all of them in the last year or two. I refrain doing "best", "worst", "top-10" lists, but I will probably do a short list of "titles I am most likely to see again in the medium term". I invite all to do the same; maybe we'll start a separate thread.