David, I just checked what Ancestry was using so took the first name [AB. Abbs, M.J.] on the list from HMS Barracouta and entered a search in the UK, Naval Medal and Award Rolls, 1793-1972. It came up as follows:
Name: M J Abbs
Medal or Award: Queen's South Africa Medal and King's South Africa Medal
Service Year: 1899-1902
Service Location: South Africa
Campaign or Service: Anglo-Boer War
Ship Name: Barracouta Source Citation: Class: ADM 171. Piece: 53.
So it would seem Ancestry has ADM 171. Piece: 53 on line.