Guest, as the previous posts have made clear this song is by Keith Hancock and he should be credited rather than the Fureys, who are not the only ones to have covered it.

Keith now lives in Vietnam. A few days ago he suffered a heart attack and needs surgery. Fortunately a fundraising effort by his friends seems to have raised enough to pay for this. The fundraiser has now closed, however if any of his friends and admirers wish to help towards his recovery then you can find more information here:

Fundrazr - Keith Hancock needs your help