Lord Adonis, who served in government with Malcolm Wicks, said it was "terribly sad news".
Earlier Pensions Minister Malcolm Wicks told BBC Wales that the Bill published last month was not retrospective.
The more urban-north of the previous constituency was hived off and Malcolm Wicks became its first MP.
The Croydon North and Middlesbrough polls were triggered by the deaths of MPs Malcolm Wicks and Sir Stuart Bell.
Politicians from all sides have paid tribute to former energy minister Malcolm Wicks, who died on Saturday after suffering from cancer.
Work and Pensions Minister Malcolm Wicks argued tax credits were one of the ways the government was helping to make work pay.
But the committee, chaired by Malcolm Wicks, says that governors should be given access to more training and greater recognition for their efforts.
BBC: News | Education | Shopping for governors in the supermarket
Labour leader Ed Miliband is among the political figures who have paid tribute to former energy minister Malcolm Wicks, who has died aged 65.
His first step on the ministerial ladder came two years later, when he was made Personal Private Secretary (PPS) to Malcolm Wicks, then pensions minister.
Malcolm Wicks, the energy minister, points out that the target is for Europe as a whole, and suggests Britain might manage 10-15% by the deadline.
The resignation of Conservative MP Louise Mensch and the recent deaths of Labour's Malcolm Wicks and Sir Stuart Bell mean by-elections are due in Corby, Croydon North and Middlesbrough.
Energy Minister Malcolm Wicks calls it "an exciting 21st century idea" and says "We have to think in revolutionary terms if we are to move away from a carbon intensive society".
Mr Davies said he had made his position clear to UK Energy Minister Malcolm Wicks, and would do so again in relation to the new Department of Trade and Industry led Review.
BBC: NEWS | Programmes | Politics Show | Wales: Nuclear future?
Pensions Minister Malcolm Wicks has told BBC Wales he did not not want to raise expectations of compensation for the 800 former Allied Steel and Wire (ASW) workers who lost their jobs and pension entitlements when the company collapsed in July 2002.
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