Thomas, to deal with the unoverprinted and unsurcharged stamps first,
2 Pies: depends on the perforation: perf 11 is SG 101c (60p), perf 13 is SG 101 (20p), and perf 11x13 is SG 101d (£140)
3 Pies: SG 102 (30p)
6 Pies: depends on the perforation: perf 11 is SG 104a (£6) and perf 13 is SG 104 (£7.50)
9 Pies: SG 105 (10p)
1 Anna: This is a fiscal/revenue cancellation - basically worthless
2 Annas: depends on the perforation: perf 11 is SG 107a (£7.50) and perf 13 is SG 107 (£8.50)
3 Annas: SG 108 (£1.75)
The Service (On C G S) overprinted stamps:
3 Pies: SG O84 (10p)
9 Pies: SG O87 (10p)
2 Annas: SG O90 (£3)
The two surcharges:
6 Pies: SG 122 (£16)
1 Anna: SG 123 ((£2.25)
Pity about the 1 Anna stamp. With a proper postal cancellation, it would have been worth £35. Still, you had a bit of luck with the SG 98a. That spelling error does sometimes slip past the dealers. I was lucky enough to buy this example

on
ebay as the normal stamp. The normal is worth £2.75, but the error is £27 - and much scarcer still on cover.