Hmm, are you sure it's only £1000? I found the post to which I referred:
Account Statement showing Bond Repayments
This shows a monthly payment of £1064, which gives a £90,000 repayment over 7 years. As I say, I'm not sure on the circumstances of this but they were all in lump payments, suggesting hat it came directly from the airline (rather than the person in question paying back extra off his own back).
Thoughts?