Thanks Martin, Sam and Les, that filled a couple of gaps I did not know I had!
Martin - As you know I am working through alphabetically OCC to double check my single and album listings. In the main chart positions 1 - 75 on singles are present and correct although I replaced a few corrupt files on the way or found found alternative versions. If it helps, attached is 1989's tracks that I had or that came from Sam plus a few I picked up along the way for positions 76 - 100.
Before you go on a mad hunt for missing tracks have a quick review of the list as I might be able to help. I have checked A - K artists so far for all years.