It will not be shown because ITV would rather spend their money on other programmes. It doesn't matter to them that SPN has loyal fans and that they season five could possibly be the last series.
Here is a petition that you could sign. http://www.gopetition.com/online/29070.html
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No, the last episode aired in 2002.
To answer your question a total of 4 seasons have aired and season 5 started last weekend.
yes there is a season 5 for pretty little liars
A comic strip of season 6 was published, but the show was never aired due to some complications between the TV stations and the creators.
Jo dies in season 5 episode 10 titled Abandon all Hope