You are not paid 1000 quid for the last 6 months at all.... Once you have a type rating with an airline you are given I think 500 quid a month for the duration of the type-rating and then are paid roughly 1000quid/month although this varies down to a lower sum for some airlines for the first 6 months on the actual line before you are permanently employed with that airline. If/when you get a permanent contract then you are on a salary and no longer part of ctc.