British cargo ship Ability lost according to the War Cabinet Weekly Résumé No. 64 of the Naval, Military and Air Situation 14-21 November 1940

An item reported the loss on 18 November of the British motor barge Ability, tonnage 293 tons, loaded with cement, underway from London, England to Yarmouth, England when mined on the position off Clacton. Not part of a convoy. No casualaties.

Source

National Archive UK. CAB-66-13-37.