from email - can anybody identify the Ken Stephens song about the Union Castle ships leaving Southampton

Here's the letter:

Hi Joe
In the early 1980’s I worked at Netley Waterside House, Southampton where Ken and colleagues would entertain guests on a regular basis with wonderful folk songs.
It was here I first heard’ Survivor Leave’
He did make a CD of his songs which I have for years been trying to get hold of to no avail.
One song in particular I would love to hear was about the Union Castle ships leaving Southampton. In the song he refers to her lavender hull and the day ( I think Thursday) that she sailed for South Africa.
My late husband was in the Merchant Navy for many years ,mainly on the Union Castle Line. I remember us going to Southampton to see the Edinburgh Castle at the end of her service.
I would love to hear this song and I am hoping someone in your group may have heard of this. The CD it was on also had Survivor Leave.
My son has just sent me a link to your website which plays Survivor Leave as he remembers it so well and he was only a youngster at the time.
I have continued to love folk music . Cyril Tawney was a family friend whom I am sure you know well his songs about the Royal Navy. Five Foot Flirt is one of my favourites.

Kind regards

Christine C age 83
Greenwich
London