You might perhaps call them "my mates", but Shane MacGowan is a skilful enough writer to know that "my friends" SINGS better than the mumbly "my mates". These things matter.
A lyric in the Kurt Weill/Ira Gershwin song "My Ship" in the show "Lady In The Dark" went
I will wait for years, till it appears,
one fine day, one spring
But something had been bugging a cast member, listening to a rehearsal, and finally, he spoke up: "Why", he wondered, "does she wait four years? Why not three years or five years or.........."
The lyric was changed that day and has, ever since, gone
I will wait the years, till it appears,
one fine day, one spring
which is grammatically inept, but sings like a dream.
Yes, that's it Philip. It flows, it gets the point across, and it doesn't sound manufactured.