Married men were exempt from conscription until June 1916. Richards brother Walter died July 1916 then James September 1916 serving their country then his son James was born October 1916. He could have applied for exemption from conscription on these grounds to his local military services tribunal. Another reason he wasn't conscripted is he could have been in a reserved occupation or only able to do light work such as Heywood mentions as a clerk.
As for the trips to Ireland three of Richards Grandparents originated for Ireland so perhaps he was visiting family.