For those looking to leave industry or jobhunters so you can calculate take home pay and know what you need to earn as a salary to meet outgoings,
http://www.listentotaxman.com/index.php?calc=1&year=2007&age=0&add=0&taxcode=&period=1&ingr=33000&Submit=Calculate
http://www.tfpl.com/permanent_recruitment/candidates/pcalculator.cfm