Folks, VISA are generally expensive, sometimes a complicated process and long waiting times - mainly thanks to many illegal immigrants and overstayers in the UK.
Just take a look at how some countries, such as Singapore take action:
http://en.wikipedia.org/wiki/Caning_in_Singapore
Illegal entry into Singapore: At least three strokes
Unlawful overstay in Singapore for over ninety days: At least three strokes
Cheers,
Ben B