Hi
I think I might be there.
If you go to the link in No.1 in my signature and then to the last post you will see a spreadsheet called LoanAnalysis. Download it.
You can use it to look at the balance of loan 1 at the settlement date. Eneter the total amount of the loan in the first box (cash + PPI) which is £6,109.60. term is 60 months and monthly repayment is £142.47. Look down the list for payment 7 and you'll see the balance on the loan at that point is £5,596.96. You settled it with an amount of £4,668.70 so I reckon there was a rebate of PPI which accounts for the £900 difference.
So as both loans are now paid off, lets look at what you should get back....this is broadly speaking without putting into a spreadsheet but it comes very close to your offer.
Loan 1 PPI premium £1,109.60
Loan 2 PPI Premium £3,189.36
Loan 1 PPI Bank Interest £442.60
Loan 2 PPI Bank Interest £1,204.61
Statutory Interest £1,535.44 (Sum G19.G106 on your spreadsheet - bear in mind the entry in G106 isn't right)
Total of the above = £7,481.61
Then deduct the calculated rebate on PPI for loan 1 as discussed above of £928.96 and you get £6,552.65 which is £85.91 different to the amount they are offering.
Pretty close I think so I reckon they are about right IF you had a rebate. You can always check that with the bank.
Hope this helps
Regards
ims