The title refers to the Robert Burns poem, "Ae Fond Kiss".
All Eva Birthistle knew about her character prior to filming was that she was a school teacher. Ken Loach only shared the first 40 pages of the script with her - she had to figure out the rest herself.
Contrary to what he states, the sweet dish Casim serves Roisin is 'Ras Gulla', not 'Gulab Jabun'.