Richard,

The higher note in B -bar 4 crept into the New Victory Band's version during the early 1980s - part of the folk process as you suggest.

The accidentals in the D music are as I recall hearing the tune but I can give no guarantees that they have not been subject to the folk process also as I didn't record the tune and play it back later - I took it away in my head with all that entails.

However, I'm intending to be at Bacup this Easter and will check it out if I get to hear the concertina band.

In the meantime I'm going to order the sheet music from the Australian National Library and see what, if anything, the Bacup musicians have done to the original, not that it will change the way we play it - just for interest.