Joe, I've left out Tommy and Colm's adress and phone but have left in the rest of Robbie's reply below:
"You do not need permission to record a song that has already been published, as these two songs have already been by virtue of being issued on albums. However, it is usual to obtain a mechanical liscense from the Publisher, which in this case is Elmgrove Music, which is their own publishing company. Tommy and Colm Sands can be contacted at:"
Hope this helps.
Jack Murray