A mother and her former partner who murdered her 18-month-old son in a “wicked and torturous attack” have been jailed for life. Sian Hedges and Jack Benham learned their fate today after brutally killing Alfie Phillips in a night of “violent discipline” inside a caravan home in Hernhill, near Faversham. The cruel pair were sentenced in front of TV crews at Maidstone Crown Court today, in a first for any Kent court. Hedges, 27, must serve at least 19 years while her ex-lover Jack Benham, 35, will not be considered for release until serving 23 years after taking a leading role in the attacks. It…