The NPV one was quite fun i thought.... (fun as in as much fun as these exams are)
as soon as you figured that a_bar_1's would be a factor on most of them, then it seemed quite nice... from memory i got a ~£600m positive NPV...
I bet you did enjoy the interest only loan question, it seemed pretty similar to your question last night

hopefully all you did for the accumulation of the extra premiums was add on (5000-1060)s_due_10 to the value you had in (b) it was annoying that Q how it only gave you total marks at the end...
the last part (from memory) i got 7092pa payable monthly in arrears (it wasnt clear on this bit what type of payments, but seeing as the loan charged interst 6% pa in arrears, i figured the repayments would be like that too)
the only other thing with that question was it seemed like there was something missing

perhaps a bit more padding out of the question to involve his conversation with the bank manager ala "brand new customers only - nationwide" adverts... (too much to deciper in that Q)
I know i messed up the arbitrage Q but that bit was only 2 marks... i got it should be the same price as A.. (20p) mainly because i didnt think it gave any interest rates... i rushed it but ah well its only 2 marks...