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Staff Costs - Additional Information (Details) £ in Millions	12 Months Ended
	Dec. 31, 2019 GBP (£) Director	Dec. 31, 2018 GBP (£) Director
Classes Of Employee Benefits Expense [Abstract]
Number of directors, exercised share options | Director	1	1
Gain on exercise of option | £	£ 1.4	£ 4.2

X

- References

No definition available.

+ Details

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X

- Definition

Gain on exercise of option.

+ References

No definition available.

+ Details

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X

- Definition

Number of directors, exercised share options.

+ References

No definition available.

+ Details

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