Folk song in England, do you mean
Aren't there any Irish people living in England then?
The two traditions are inseparably connected, socially, politically, artistically and by language.
The Irish tradition is full of songs that probably originated in Britain - there were more Child ballads extant in the latter half of the twentieth century in Ireland than there were in Britain - and in a far better condition.
I repeat from above:
I attended a talk given by Peter Cook once where he discussed the richness of the oral tradition in Aberdeenshire, particularly in relation to the Greig collection
He projected a 19th century map of the area onto a screen and then superimposed a plan of all the railways, roads and canals being worked on at the time"
THe workers on those railways, roads and canals in the mid 19th century were Irish, and Cook's conclusion was that one of the reasons for the great richness of the New Deer song tradition was the Irish influence.
Irish, English and Scots Travellers were freely moving songs about Britain without even having access to literacy.
One of the great feature's of America's Library of Congress collection is that it it totally aware of foreign influences in its native traditions - Britain maintains its Brexit -like approach towards English song
Jim Carroll