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National Grid Gas plc Annual Report and Accounts 2009/10 79
9. Debtors
2010 2009
£m £m
A
mounts falling due within one year:
Trade debtors 58 44
A
mounts owed by fellow subsidiary undertakings 24 183
Corporation tax 10 -
Other debtors 54
Prepayments and accrued income 200 218
297 449
A
mounts falling due after more than one year:
Other debtors 86
A
mounts owed by immediate parent undertaking 5,611 5,611
5,619 5,617
Total debtors 5,916 6,066
10. Derivative financial instruments
The fair value of derivative financial instruments shown on the balance sheet is as follows:
Assets Liabilities Total Assets Liabilities Total
£m £m £m £m £m £m
A
mounts falling due in one year 72 (30) 42 122 (67) 55
A
mounts falling due after more than one year 565 (121) 444 688 (42) 646
637 (151) 486 810 (109) 701
2010 2009
£m £m
Interest rate swaps (3,154) (2,924)
Cross-currency interest rate swaps (1,748) (1,525)
Foreign exchange forward contracts (39) (15)
Forward rate agreements (1,730) (3,345)
(6,671) (7,809)
*The notional contract amounts of derivatives indicate the gross nominal value of transactions outstanding at the balance sheet date
For each class of derivative the notional contract* amounts are as follows:
2010 2009