Matches in Divisions 8, 9 and 13 to 16 inclusive called off due to weather may be refixed. Matches in Division 3 to 7 and 9 to 12 (both inclusive) may not be refixed unless the return fixture also gets cancelled.
Matches in Division 1 and Division 2 must be refixed.
The full regulations can be found in part 10 of the the General Playing Regulations