I can't give you the original tune/chords. When I first saw the lyrics I liked them very much, but couldn't find the tune. So, as I often do in such a situation, I made up my own tune. So here it is for what it's worth. I rather like it. Later, after hearing the original Phil Coulter version, I still like my alternate tune/version.

Here it is in abc format. To get a score and a midi file, copy and paste the abc into Concertina.net convert-a-matic

X:1
T:Home From The Sea
C:words, Phil Coulter/music, Stewart Hendrickson
M:3/4
L:1/8
Q:1/4=145
K:D
z4A A|B2A2F2|F4D D|E2D2B,2|D4B,2|A,4D2|F2A2A2|E6-|E4A2|B2A2F2|F4D D|E2D2B,2|D4D B,|A,4D G|F4E2|D6-|D4D D|G2G2G2|B4B B|B2A2F2|A4D2|D2D3D|A2A2F2|E6-|E4A A|B2A2F2|F4D2|E2D2B,2|D4D B,|A,2D2G2|F4E2|D6-|D6||"^Chorus"G6|B6|B2A3F|A6|D2D2D2|A4A2|A2A2F2|E6-|E4D2|G2G2G2|B4B2|B2A3F|A6|D3D D2|F4F2|E2D2C2|D6


Cheers, S. in Seattle