let us not forget the massive 19th century exodus from Ireland to all ... repeat all parts of Britain bringing their music with them.

It is also well documented that Irishmen came over to England at harvest time for work and then return home when the harvest was in until well into the 20th. century.

These people will certainly have brought their music with them, and they will also have learnt new tunes and songs from the the locals and taken them back home, so it is often difficult to say where particular songs and tunes originated. The use of specific place and/or personal names is not necessarily a good indicator as these will have likely been changed and localised when the song moved to its new location.