I remember this one at the time, partly because it's a dark and grim story, but partly, as a kid collecting AF figures in Carlisle, to see that Carlisle is where much of the action occurs.
The comics were altered to improve contrast and colours, recolourisation of some of the more bizarre colour choices, light and shading, other embellishments (signs, Z force badges for Trent etc), then a light grain added to give it a less flat and grittier feel.
Here's a comparison...

and two of the pages (note these are resized by photobucket)

