G'day Martin,The MIDItext is from Sally's singing of I've Been a Wild Boy and there are, undoubtedly, some differences from the Here's a Health to the Company tune as I heard it some 20 years back. I won't vouch for the distribution and use in UK or Ireland folk sessions, as I have never been to either ... I am only drawing on my memory of the singer's remarks.
I must say, on reflection, that there is some humour in trying to pin down the precise provenance and peregrinations of a song called The Wild Rover!
Regards,
Bob Bolton