I could put up links that counter the one you posted, but I've avoided doing so because as yours is, they are seen as biased and partisan.
Could you explain how the UCL study (and I've read the full version) is biased and partisan? It doesn't seem so to me (and I've read the full report), and knowing some of the staff in the migration research centre at UCL, I'm 100% sure that if they'd found the opposite findings (i.e. greater dependence on benefits among migrants than among natives, and/or that the net economic and fiscal impact of recent migration was negative) they would have reported it transparently. It's also worth mentioning that unlike the media articles which so many people are citing on here, the UCL research (in line with good scientific practice) cites all its data sources, so that others can replicate their empirical analysis if they wish to, and the research is also subject to independent peer review (again in line with establised scientific practice).