Pain, by definition, is something unexpected, a reaction to something unusual and unpleasant, never ordinary. The oxymoron 'ordinnary pain' makes the reader consider what is meant. The kind of pain experienced in 'rural England' isn't really pain at all, but unhappiness which can be solved by mere sunshine. This makes us wonder what kind of pain is being experienced abroad: it must be terrible, agonising, serious and real pain.