Mark Gettleson from the Howard League for Penal Reform said the Government's proposals to give ex-prisoners supervision in the community is "an admission that short-term prison sentences are failing".
He added that prisoners are currently "being warehoused in enormous overflowing prisons, rather than being given something useful to do on the outside."
More top news
Selfless Donna Wood from Staffordshire has left her husband and children at home so she can help save lives in Sierra Leone.
From Sierra Leone to Cyprus, 8,500 Christmas boxes were sent out to every serviceman and woman from the UK.
Thousands of people have switched off their Christmas lights as a mark of respect for the victims of the Glasgow bin lorry tragedy.