Remove the 28-day time limit from the unduly lenient sentence scheme for murder

Currently the families of murder victims have no recourse against an unduly lenient sentence if they do not apply within 28 days. I am campaigning for this change because 28 days is not long enough when a family is grieving. My sister was murdered in 2013, we believe her killer meets the criteria for a whole life order but he was only given a minimum sentence of 35 years. We believe this is too low, and that we should have the right to apply to have this sentence reviewed.