Capture already looks quite good, it comes from the DVD I guess
You can replace a picture using the "Set picture" link from the yellow title bar, but in this case I do not think it is really useful...
Or maybe you already replaced it? I guess that it is the case, when I see the low-quality picture of the TR5...
Once you replaced the picture you have to click "Refresh" or press F5 to see the new one, as the old picture is in the cache of your browser.
I guess that I was seeing the new capture, but you were seeing the old one, that explains why I was wondering why you would replace it
Come to think of it, since the whole film was shot in the US, is this an XK-E rather than an E-Type? But it is Right-Hand-Drive, so it could be an imported E-Type.