If they need to lose 0.2 of a teacher somewhere then they will be overjoyed. If they don't, then they may not. Yes, if your school agrees to the change to 0.8, then your TLR will reduce by 20% at the same time. You won't quite lose 20% of your take-home pay, because of tax changes, but you will be paying less into your pension. See www.tesfaq.co.uk/pay for a calculator to look at the changes to your take-home salary.