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54 National Grid Gas plc Annual Report and Accounts 2009/10
13. Inventories and other intangible assets
2010 2009
£m £m
Raw materials and consumables 28 29
Other intangible assets 15 5
43 34
Other intangible assets consists of emission allowances.
14. Trade and other receivables
2010 2009
£m £m
Trade receivables 59 47
A
mounts owed by fellow subsidiaries 22 179
Other receivables 57
Prepayments and accrued income 202 217
288 450
Provision for impairment of receivables
£m
A
t 1 April 2008 2
Release of provision 1
A
t 31 March 2009 3
A
dditions net of recoveries 15
At 31 March 2010 18
2010 2009
£m £m
Up to 3 months past due -3
3 to 6 months past due 12
Over 6 months past due 13
28
For further information about wholesale credit risk refer to note 28(c).
Trade receivables are non-interest bearing and generally have a 30-90 day term. Due to their short maturities, the fair value of trade and other
receivables approximates to their book value.
A
s at 31 March 2010, trade receivables of £2m (2009: £8m) were past due but not impaired. The ageing analysis of these trade receivables is
as follows: