If Ronnie Drew sang a song written by Shane McGowan, it must have been in the Shane McGowan documentary, which I didn't see.

For the record in the "Folk Hibernia" documentary, Ronnie sang "I'll tell me ma", Port Lairge (I was a day in Waterford) and Cutting turf in Ardee. He also sang McAlpine's Fusileers, which I think The Pogues recorded also, but it was written by Dominic Behan, either when Shane was very young, or possibly before he was born.

The Pogues sang two of Shane's songs in the doc - The sick bed of CuChullainn and Fairytale of New York (Shane's lyrics) and also Ewan McColl's Dirty old Town.