The magazine benefited from IPC's vast size and unusual synergies by being plugged in the boys comics line (notably EAGLE) where all the scans below came from.
I was pretty indifferent to computers at this time so I was never tempted to buy an issue. Indeed, I don't think I ever saw one on sale nor did I ever meet anyone else who owned a copy. Nor have I ever found one since. All this may indicate why, despite some spirited cross-promotion (including the four-page 'supplement' in October 1984), Big K didn't last long (some internet sources say a year).
Apparently, the latter issues reprinted the SHATTER computer-created comic strip that was published by First Comics in the States. It's notable for being the first computer-generated comic... and virtually unreadable too.
Eagle 10 March 1984
Issue 2 House Ad
Eagle 14 April 1984
Issue 3 House Ad
Eagle 19 May 1984
Four-page insert (EAGLE, 20 October 1984):