Ion Berkeley:
Your photograph of the 'c' cockpit window is certainly similar in shape to the aperture in the wreckage photgraph, but it is much bigger and nevertheless a different shape altogether.
Oldwolf: The Trident 1C did not have a centre fuel tank. All fuel was carried in the wings and the only access to them was by way of the normal removal plates which can be seen removed in one of the archive photographs. I did not fly the Trident 1E, which may have had a centre tank. The Trident 2 certainly did have one, which held about 8000 kg of fuel, but there was no door, such as the one in question, on that aircraft either.