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Property, plant and equipment - Additional Information (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, plant and equipment
Impairments on fixed assets	£ 0	£ 8	£ 0
Freehold buildings | Minimum
Property, plant and equipment
Property, plant and equipment, estimated useful life	50 years
Freehold buildings | Maximum
Property, plant and equipment
Property, plant and equipment, estimated useful life	100 years
Vehicles | Minimum
Property, plant and equipment
Property, plant and equipment, estimated useful life	4 years
Vehicles | Maximum
Property, plant and equipment
Property, plant and equipment, estimated useful life	10 years
Plant and equipment, including service contract equipment | Minimum
Property, plant and equipment
Property, plant and equipment, estimated useful life	3 years
Plant and equipment, including service contract equipment | Maximum
Property, plant and equipment
Property, plant and equipment, estimated useful life	10 years
Office equipment, furniture and fittings | Minimum
Property, plant and equipment
Property, plant and equipment, estimated useful life	3 years
Office equipment, furniture and fittings | Maximum
Property, plant and equipment
Property, plant and equipment, estimated useful life	10 years

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- Definition

The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment]

+ References

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