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Post balance sheet events (Details) - Notice of redemption of instruments that can no longer be included as part of Tier 1 capital [Member] £ in Millions, € in Billions | Mar. 31, 2022 GBP (£) | Mar. 08, 2022 EUR (€) | Mar. 02, 2022 GBP (£) | Feb. 01, 2022 GBP (£)
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Perpetual Regulatory Tier One Security (ISIN US780097AH44) |  |  |  |
Post balance sheet events |  |  |  |
Notional amount |  |  |  | £ 1,200.0
Interest Rate |  |  |  | 7.648%
Perpetual Regulatory Tier One Security (ISIN US780097AH44) | Forecast |  |  |  |
Post balance sheet events |  |  |  |
Redemption of subordinated liabilities |  |  | £ 67.5 |
Fixed to Floating Rate notes due 8 March 2023 | Forecast |  |  |  |
Post balance sheet events |  |  |  |
Redemption of subordinated liabilities | € |  | € 1.5 |  |
USD Series U Non-Cumulative Dollar Preference Shares (ISIN US39057AA62) | Forecast |  |  |  |
Post balance sheet events |  |  |  |
Redemption of preference shares | £ 1,013.0 |  |  |

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- Definition The expected cash outflow on the redemption or repurchase of puttable financial instruments classified as equity. [Refer: Liquidity risk [member]; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 136A -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_136A_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The cash outflow for repayments of subordinated liabilities. [Refer: Subordinated liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_17&doctype=Standard -URIDate 2021-03-24 + Details
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