"According to 'google' 320000 people left Britain in 2103 so it evens up."
Uh, no. 320,000 people left, 640,000 arrived.
There was a net change in non-British EU workers registered of 300,000. That's NET, including all the people going home.
Without the Eastern European immigration, we would have close to zero net migration.
"Our perception that it's overly dense is partly because people in the UK just don't want to live in apartments - they want 3 bed house with 2-car drive and a garden."
And why should we change our way of life ?
"Additionally there are almost as many Brits living abroad as foreigners living here - if you pulled the plug on one you'd have to recall them all back and then where would you be?"
That's a stupid argument. If, say, Dubai, asks for foreign workers, that's their business. It doesn't imply that we in England should do the same.