Question:
Which position did William Montagu-Pollock hold in Oct, 1958?

Context:
 William Montagu-Pollock holds the position of ambassador of the United Kingdom to Syria from Jan, 1950 to Jan, 1953. 
 William Montagu-Pollock holds the position of ambassador of the United Kingdom to Switzerland from Jan, 1958 to Jan, 1960. 
 William Montagu-Pollock holds the position of ambassador of the United Kingdom to Denmark from Jan, 1960 to Jan, 1962. 
 William Montagu-Pollock holds the position of ambassador of the United Kingdom to Peru from Jan, 1953 to Jan, 1958.

Answer:
ambassador of the United Kingdom to Switzerland