Section 12 Persons serving again after retirement.

if a lump sum was granted on that retirement without any contribution being made, then unless that person on resumption of. . . service, or within three months of. . . marryingF2 or forming a civil partnership while again serving, refunds by way of contribution one half of the lump sum, no pension shall be granted to any widow, widower, surviving civil partner or child of that person; and

any lump sum granted on that retirement, less any refund, shall be set off against any lump sum to be granted in respect of that person's service.