Michael was used to offering things with no intent of ever following through with them, it was definitely a character flaw, and a strong one at that, something that he couldn't entirely blame on his time in L.A. He probably would never actually invite Julian to England, so why did he offer? Empty promises are best left simply not offered at all. Julian was successful, ran his own bar/club, and knew what he liked in life, so in many ways they were very similar, perhaps too similar to actually get along. Still, he didn't want to let this stop him from visiting Casket, he did want to find at least one night spot in this town.
"Perhaps you will. It was a pleasure meeting you as well," Michael shook Julian's hand. It had certainly been an interesting experience.