What type is this aircraft, appearing in the movie "Kingsman"? In a scene of the movie Kingsman: The Secret Service the young aspiring agents have to skydive from an airplane. I didn't recognise it: which airplane is it (assuming it actually exists)?

I could only find a picture from inside and one from below.
That distinctly squarish shape looks like a Short SC-7 Skyvan 3-100, especially since the registration on the photo from below is visible: G-BEOL. 
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(Image Source: WikiPedia - Author: Adrian Pingstone)