Saw the Producers in Manchester last night with Peter Kay as one of the stars... absolutely hysterical.
The Producers is amazingly funny anyway, but Peter Kay added so many improvised looks and pauses and movements that the rest of the cast couldnt hide their laughter at times. Including one scene where they were literally laughing out loud.
If you are going to see it then you made the right choice. Funniest thing ive seen in years.