I think this is about a girl who dates a widower. 'I can see you won't forget her/Because she meant untimely death a year ago'. He can't 'forget his first', and talks about 'British rail' and fox-hunting, which is his first love's interests, not his current. And so hence the chorus 'You can't have me, make me act the same'
I think this is about a girl who dates a widower. 'I can see you won't forget her/Because she meant untimely death a year ago'. He can't 'forget his first', and talks about 'British rail' and fox-hunting, which is his first love's interests, not his current. And so hence the chorus 'You can't have me, make me act the same'