The undercard for the Ultimate Fighting Championship’s return to London will have a distinctly British flavor on Saturday at the O2 Arena, but it speaks well of the local scene that it has supplied the promotion with a strong slate of prelims from top to bottom. The featured spot sees Mike Grundy square off with Makwan Amirkhani in a well-matched featherweight affair, but the clear jewel of the undercard comes a bit earlier when Wales’ Jack Shore takes on fellow elite bantamweight prospect Timur Valiev. There is also plenty of intrigue with the debut of high-upside flyweight Muhammad Mokaev, who takes on Cody Durden at 125 pounds.