The mathematics in post number 20 seemed a bit questionable to me, so I did a bit of tinkering in Excel. At 7.25% interest (HSBC's current rate), the payment comes to £1116 per month for six years if you assume £5,000 of interest accrues during the training at OAT. In other words, I used £65,000 as the principal instead of £60,000, the original amount borrowed.
This means the total principal and interest repaid would be £80,352.35, not the £141,000 that he arrives at with his calculations.
If you want to check it yourself, the following website shows you how to create a simple spreadsheet to calculate loan repayments:
http://www.meadinkent.co.uk/excel-loan-repayments.htm
Using the first example on the above website:
Cell B2 must contain the following value: 65000
Cell B3 must contain the following value: 72
Cell B4 must contain the following value: 12
Cell B5 must contain the following value: 7.25%
Cell D6 must contain the following formula: = C6/12
Cell C7 must contain the following formula: = - PMT(C6, B4, B3, 0, 0)
I don't really know how much interest accrues during training because I don't know when the bank disburses the funds and I didn't want to bother with the rather complicated spreadsheet required to compound interest when no payments are being made, but £5K is probably overly generous. It is also likely that HSBC uses a slightly different method to calculate interest, but I can't think of any common way of calculating loan repayments that would arrive at a £60,000 difference from the above £80,352 on an original loan of £60,000, which is what Nichibei Aviation's mathematics demands.