Richard,
"The official statistics I linked to on the other thread showed immigration as having fallen and still falling. So I don't see the need for any further steps yet. I particularly don't see the fact that proportionally more immigration is from outside the EU as cause for concern."

The concern is that EU incomers are very likely to return, but not those from third world countries.

The fall you refer to is mainly due to EU returnees.
Non EU immigration remains historically high.

Until 1982 there was a net outflow of migrants from Britain.
Between 1982 and 1997 average net immigration was about 50,000 a year. It has
climbed rapidly since 1997 to reach a peak of 244,000 in 2004. This has now fallen to
about 190,000 a year.