28. In the case of a total and permanent disability or in the case of physical or mental disability, death or cessation of employment or where the employee ceases to be a member of the plan, the provisions of the former pension plan which concern entitlement or computation of a pension continue to apply in respect of the years or parts of a year of service credited under the former pension plan.
In the case of death, those provisions continue to apply only if they are more advantageous than those of the plan. The same applies in the case of a total and permanent disability or in the case of physical or mental disability, but only until a pension becomes payable under the plan.
If the person referred to in the first paragraph was a member of the Civil Service Superannuation Plan or the Teachers Pension Plan on the day preceding the day on which this Order in Council became applicable to the person, the average pensionable salary provided for in section 27 is used for the purpose of computing the pension.