Not British, but I've been there!
The "Not
These Huddled Masses" Comedy Tour
"No Smoking Please, We're Americans" (or maybe "Finally, We Can Smoke Comedy Tour")
"Red, White, and New"
Yeah, I leave the funny to the professionals. Still, though, if your comedy isn't really about working the race angle I think I'd leave race and related ideas out of the title. Nobody wants to go to the "Edgy Racial Comedy Tour!" and find out it's all "man, how about airplane food, huh?"