You probably will have to struggle for the year until next year, sorry Claire. The tax credit system stinks. We had similar because I went part-time in November 07, so this years tax credits award is based on half year fulltime wage and half parttime. We'll get more next year, but that doesn't help us now.
Although, they do say that if your wages drop a significant amount, to let them know. So it may be worth giving them a call.
