Find out if a film is on iTunes, Amazon Prime, Netflix or Now TV

Searching for Catherine Tate

Is Nativity 3: Dude, Where's My Donkey?! available on iTunes, Amazon Prime, Netflix or Now TV?
Is Shakespeare Live! From the RSC available on iTunes, Amazon Prime, Netflix or Now TV?
Is Starter for 10 available on iTunes, Amazon Prime, Netflix or Now TV?
Is SuperBob available on iTunes, Amazon Prime, Netflix or Now TV?