Man, I've been thinking more about a Cornettos Trilogy maze and honestly, I'd be pretty stoked to see it come.
Have it be like AHS n 2016 or Titans this year, where it begins with a long section (Shaun of the Dead), followed by a short section (Hot Fuzz - favorite movie in the trilogy, but not horror) and then ending with a big special effects showcase (World's End).
Shaun of the Dead could begin in the Convenience Store, go through Shaun's Apartment (with the roommate in the shower) and backyard, through some london streets with Shaun's dad in the car, then past some backyard fences a la El Cucuy and Ash (with Shaun attacking from above, of course). Climax at a Walking Dead style zombie-mob outside the pub.
Hot Fuzz could be a few rooms like the actors' death scene, the flower shop, and the hotel room, before going through the "GREATER GOOD" scene and the pile of corpses with the living statue. Ends during the shootout in the grocery store / the miniature village with some Ash-style character interactions ("FASCIST!" "Hag.").
World's End could be the bathroom fight, the twins, and the fight in the barroom. Stick Walker from Roanoke could become one of the Modern Art statues. Expect lots of dismemberment, people holding heads (blue blood this time!) and maybe even some scenes of Gary King crying.
Have the whole maze end at the pub, with characters from all three attacking; zombies from Shaun, the Sandford citizens from Hot Fuzz, and the Aliens from World's End.
EDIT: Speaking of zombies, 28 days later might be a cool layover for London Streets this year. I know that franchise is apparently dead, but it was awesome while it lasted, and it'd be nice to see some fast zombies for a change.