The album version is in the key of F major, played on a C/F melodeon. I have transposed it into G to be D/G melodeon friendly.
Some Notes on the Tune
The guitar chords indicated are harmonies implied by the guitar, which to me stands out as the main harmonic instrument on the album recording. The melodeon does play chords the second time through, and these mostly follow the guitar. The chords given will work as a starting point to build your own harmonic structure and arrangements.
It is also worth noting that the third time through on the album, the melodeon switches in the 3rd voice and octave lower (a good trick on an instrument with the stop options - Andy Cutting tends to play a Castagnari Mory which has the stops on the back of the keyboard, operated by a thumb switch). This leads to the tuning sounding an octave lower, but of course keeps the same fingering pattern.
I have indicated on the video the various sections and also played the different ornaments and trills slowly and obviously to make them easier to learn by ear. The same ornaments are also indicated on the sheet music.