The risk of queuing?
Got a short article in the Times today about the UK Border Agency relaxing its checks over the summer.
I wish I had included the following interesting information provided by the excellent Home Office Immigration Statistics April-June 2011. In 2010 there were around 100,000,000 admissions to the UK , and around 19,000 non-asylum individuals were refused entry. That's around 1 in 5000 admissions, about 35 plane-loads.
So someone should be able to estimate how many people were admitted who would otherwise have been refused entry - it may not be very many.