London-based boutique Powell Gilbert features extremely prominently in our findings. The "phenomenal" Penny Gilbert is "absolutely fantastic". Accompanied by the "superb" Tim Powell, the pair are two of the most highly-nominated practitioners in our international research. Sources praise the "highly responsive" team's winning formula that combines a "terrific grasp of complex scientific issues", "a depth of legal know-how", "superior litigation skills" and "exemplary levels of client service". Zoë Butler and Alex Wilson are "first-rate" and "incredibly consistent - a joy to work with".