Not sure if the lines will come out right.Try this(two main beats per bar, I've marked the chord for each)
/DD/GG/DD/A7A7/DD/GG/GD/A7A7/
Repeat as necessary, this sequence is right for the A music and the B music. Mind you, as always with folk music, I am talking about the version I know. Which may, for all I know, be different from the Sharpe one, because I've never seen the programme. Give it a try, anyway. Some versions end differently, so it's not guaranteed.