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Revenue and contract balances (Tables) | 6 Months Ended
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Jun. 30, 2018
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Summary of Contract Assets and Contract Liabilities | Contract assets and contract liabilities were as follows:
|  | Six months ended 30 June 2018 |  |  | Six months ended 30 June 20171 |  |  | Year ended 31 December 20171 |
|  | £m |  |  | £m |  |  | £m |
Contract assets |  |  |  |  |  |  |  |  |  |  |  |
Accrued income falling due within one year |  |  | 3,672.4 |  |  |  | 3,379.4 |  |  |  | 3,205.8 |
Accrued income falling due after more than one year |  |  | 21.8 |  |  |  | 21.9 |  |  |  | 20.5 |
|  |  | 3,694.2 |  |  |  | 3,401.3 |  |  |  | 3,226.3 |
Contract liabilities |  |  |  |  |  |  |  |  |  |  |  |
Deferred income |  |  | 1,284.5 |  |  |  | 1,188.3 |  |  |  | 1,212.1 |
Note
1 | Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers, as described in note 2.

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