e.g. if I work on a sunday i get a £30 supplementary payment, but i only work 1 in 4 sundays. If you work over i think it is 43 hours a week, you get paid at time and a half for the hours over that amount, (it may be 42 actually) plus if you work a bank holiday and you get double or triple time, that is not ordinary time,
if it is a sales job it may be you only earn the advertisaed salary if you reach your target Jumbuck, in which case avoid those jobs at all cost crapmemory
Same here - On Target Earnings. It means that's what you could earn if you hit your minimum targets. It's a term you usually find in advertisements sales and marketing type job.
I've also heard it used for Ongoing Temporary Employment, where they take on temps so as not to have to give them all the advantages of full time employment. They then renew the temporary employment when the initial contract period is up.