Abbott died 1977, and has a wikipedia page: https://en.wikipedia.org/wiki/George_Abbott_(GC) That's the most complete description of the rescue I can find, and is backed up by other sources. I haven't linked.

This source suggests he and Knowlton declined to exchange their medals: https://www.google.co.uk/books/edition/The_Complete_George_C...

Picture of Abbott: https://victoriacrossonline.co.uk/george-fawcett-pitts-abbot...