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

Searching for Sarah Miles

Is Hope and Glory available on iTunes, Amazon Prime, Netflix or Now TV?
Is The Hireling available on iTunes, Amazon Prime, Netflix or Now TV?
Is Those Magnificent Men in Their Flying Machines or How I Flew from London to Paris in 25 hours 11 minutes available on iTunes, Amazon Prime, Netflix or Now TV?
Is White Mischief available on iTunes, Amazon Prime, Netflix or Now TV?