BWM,
All you've given us are copy-and-pastes of other people's opinions about a link between such suppressed wage-rates and immigration,

Yes. Ed Miliband and the Bank of England economists who know at least as much about it as you do despite your "years in senior management."

Dave and DMcG, this is from the introduction of the Bank of England report.
"Our results also reveal that the biggest impact of immigration on wages is within the semi/unskilled services occupational group."

You choose to dismiss their findings for your own reasons, but they stand.
Please direct your objections to them. I expect they will immediately withdraw the whole thing.