Here is the tune ‘The Mallard no 2’. It’s in Dave Townsend’s English Dance Tunes book but I can’t find it anywhere else – there are other tunes and songs that share the title but none with the same melody.
The PDF can be found here. Fiddle players might want to try double stopping with the open G string in the first two bars, then the D string in the next bar before going back to the G string for bars five and six. In the second section, you can double stop with the open G string for the first three bars.