Speaking during a Q&A session in Brighton, Labour leader Ed Miliband has vowed to "make work pay for the workers of Britain" and tackle a crisis in the cost of living.
He condemned David Cameron's government for allowing prices to rise faster than wages in 38 of its 39 months in office.
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Portman was due to receive the award in Israel in June and said that her reasons for skipping the ceremony were solely due to Mr Netanyahu.
Analysis of Department for Work and Pensions data found the average man receives £153.86 a week and the average woman receives £125.98.
The country says it is making the move to shift its national focus and improve its economy.