Question:
Which position did Edgar Rees Jones hold in May, 1910?

Context:
 Edgar Rees Jones holds the position of Member of the 31st Parliament of the United Kingdom from Dec, 1918 to Oct, 1922. 
 Edgar Rees Jones holds the position of Member of the 29th Parliament of the United Kingdom from Jan, 1910 to Nov, 1910. 
 Edgar Rees Jones holds the position of Member of the 30th Parliament of the United Kingdom from Dec, 1910 to Nov, 1918.

Answer:
Member of the 29th Parliament of the United Kingdom