Prior to the new JAR style of exams, individual performance exams were sat depending upon the aircraft type about to be entered on your licence.
Large aircraft - perf A:exam based on L.1011
Up to 5.7 MT [Kingair/Otter/some light twins] - perf C
You had 5 years in which to consolidate a group by completing the 1179 flight test; otherwise you lost it.
The ANO lists the various groups
