These are a bunch of gig posters that I found in storage which I've slowly scanned and am adding. There are quite a few more...I'm just not exactly sure where they are...
There is a fair sprinkling of other posters from the era throughout this site, and I've tried not to duplicate.
For many more check out Simon Coffey's archive.
and a couple of Spelling Mistakes setlists from early 1980: