A woman (for it so often is a woman) sends money home on which she has paid income tax, to support her children and to pay for their education, and you see this as "a bad thing".
If she paid any income tax? Doesn't Nick Clegg want people who earn under £10,000 to not pay any. The problem is after five years she will get settlement and then bring her children to Britain to be educated for £5000 per child, per year, while still probably earning the NMW. What is that £400 a year tax? So if she has two kids we are £10,000 - £400 a year worse off as a nation, without even counting child benefit, NHS etc.
The trouble is people like the IPPR always talk about pre settlement migrants and once they get settlement or citizenship, that say that they are citizens and taxpayers and not migrants anymore. So it is hardly surprising migrants look so good.
They also forget to mention the Danish study, which found that western workers boosted Denmark's economy and migrants from developing countries were a drain on it. Denmark changed the immigration rules and saved billions. Of course that is not very political correct thinking in left wing terms.