Provisions (Tables)

12 Months Ended

Mar. 31, 2020

Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]

Schedule of provisions

	Environmental £m		Decommissioning £m		Restructuring £m		Emissions £m		Other £m		Total provisions £m
At 1 April 2018	1,531		194		3		8		316		2,052
Exchange adjustments	103		7		—		—		14		124
Additions¹	32		18		125		16		35		226
Unused amounts reversed	(36	)	(10	)	(3	)	(6	)	(10	)	(65	)
Unwinding of discount	62		5		—		—		7		74
Utilised²	(53	)	(26	)	(42	)	(9	)	(79	)	(209	)
Transfers³	—		—		—		—		(3	)	(3	)
At 31 March 2019	1,639		188		83		9		280		2,199
Exchange adjustments	82		5		—		1		9		97
Additions¹	437		93		7		12		40		589
Unused amounts reversed	(29	)	(16	)	(16	)	—		(9	)	(70	)
Unwinding of discount	65		5		—		—		7		77
Utilised²	(123	)	(21	)	(39	)	(5	)	(50	)	(238	)
At 31 March 2020	2,071		254		35		17		277		2,654

	2020	2019
	£m	£m
Current	348	316
Non-current	2,306	1,883
	2,654	2,199

1. For the year ended 31 March 2020, £402 million (2019: £nil) of additions relate to exceptional environmental provisions, of which £76 million relates to the impact of the change in the real discount rate from 1% to 0.5% during the year (see note 5 for details). Additions to other provisions include £15 million (2019: £nil) in relation to discontinued operations.

2. Utilised amounts for other provisions include £8 million (2019: £20 million) in relation to discontinued operations.

3. Represents net amounts transferred to trade and other payables (see note 22) of £nil (2019: £3 million).

Schedule of environmental provision

The environmental provision is as follows:

	2020				2019
	Discounted £m	Undiscounted £m	Real discount rate		Discounted £m	Undiscounted £m	Real discount rate
UK sites	175	184	0.5	%	189	210	1	%
US sites	1,896	1,955	0.5	%	1,450	1,555	1	%
	2,071	2,139			1,639	1,765