21 Trade and other payables

GroupCompany
Non-current2016
£m
2015
£m
2016
£m
2015
£m
Deferred grants and contributions517.4476.7
Other creditors13.13.3
530.5480.0
GroupCompany
Current2016
£m
2015
£m
2016
£m
2015
£m
Trade payables44.140.1
Amounts owed to subsidiary undertakings9.59.2
Other tax and social security4.94.7
Deferred grants and contributions9.09.1
Other creditors3.43.71.61.6
Accruals and deferred income280.3323.6
341.7381.211.110.8

The average credit period taken for trade purchases is 26 days (2015: 28 days).

The carrying amounts of trade and other payables approximate their fair value.

Deferred grants and contributions

Group2016
£m
2015
£m
At the start of the year485.8450.7
Cash received during the year17.318.1
Transfers of assets from customers32.827.0
Credited to the income statement – revenue(2.6)(2.3)
Credited to the income statement – other operating expenses (see note 3)(6.9)(7.7)
At the end of the year526.4485.8