'Action: Flers, 13th September and following days. As officer in command of the Brigade 1st Line Transport, 2nd Lieut. Riddiford has never once failed to deliver rations and equipment to the battalions in the front line, frequently crossing the enemy's barrages. On the night of the 18th September a convoy of 16 wagons was held up on the Flers road, several casualties occurred amongst the men and horses, and the wagons had to be temporarily abandoned. In spite of this heavy barrage 2nd Lieut Riddiford by his own personal example and courage succeeded in getting his own wagons away and delivering the rations and ammunition to the troops in Flers. This artillery barrage interfering with the transport has been of nightly occurrence, and 2nd Lieut Riddiford and his men have had to face it every night during the time the Brigade was in the front line. He has always shown an utter disregard of danger and the Brigade has never once been short of rations owing to his personal bravery and devotion to duty. I cannot speak too highly of his soldierly qualities.'
Awarded, and promulgated, 'London Gazette', 4 January 1917.

Awarded, and promulgated, 'London Gazette', 31 December 1918.

'For good work as Camp Commandant of the Division for a period of two years. This Officer's care. foresight, and organising ability has ensured at all times the smooth working of Divisional Headquarters. An officer of exceptional ability.'
Source: 'London Gazette'
Date: 1 January 1919

'For conspicuous gallantry and devotion to duty during a raid on the enemy's trenches. He took charge when the Commander had become a casualty, organised a covering party, which he led with skill during the withdrawal, and remained in "no man's land" until every man was back.'
Source: 'London Gazette'
Date: 25 August 1916