The Curb Your Enthusiasm star says British comedy was his touchstone. Now he’s about to try out his mix of personal pathos and vulgarity on audiences here. He just hopes they get him ‘If you react poorly to something, we will discuss it.” With the roguish affability native to his unscrupulous Curb Your Enthusiasm character – Jeff Greene, manager and accomplice to Larry David – Jeff Garlin addresses the crowd at the Upright Citizens Brigade, Hollywood’s improvisation hotspot. It’s one of a flurry of appearances to fine tune the act for his run of shows at London’s Soho Theatre , and he relishes the ridiculousness of inviting the audience to trash it as he performs. No one takes him up on the offer – they are all enjoying themselves too much. Garlin is noticeably slimmer than his blobular Curb physique, the result of a