Calculation of service
40.—(1) For the purpose of determining the amount of any compensation payable in respect of the loss of an office to which, or of any two or more offices to which in the aggregate, a person devoted substantially the whole of his time, any previous period of part-time employment shall be treated as though it were whole-time employment for a proportionately reduced period.
(2) For the purpose of making any calculations under these regulations in respect of a person's reckonable service, all periods of such service shall be aggregated and, except where reference is made to completed years of service, if the aggregated service includes a fraction of a year, that fraction shall, if it equals or exceeds 6 months, be treated as a year, and shall, in any other case be disregarded.