Statement Of Financial Position [Abstract]
| Concept |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||
| Non-current assets [abstract] | |||||||||||||||||||||
| Investment property | — | — | — | — | — | — |
9,330,000,000
GBP
|
— |
9,658,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current receivables | — | — | — | — | — | — |
159,000,000
GBP
|
— |
146,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Non-current assets | — | — | — | — | — | — |
10,090,000,000
GBP
|
— |
10,434,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||||||||
| Current inventories | — | — | — | — | — | — |
100,000,000
GBP
|
— |
118,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current receivables | — | — | — | — | — | — |
379,000,000
GBP
|
— |
365,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — | — | — |
78,000,000
GBP
|
— |
41,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
146,000,000
GBP
|
— | — |
| Current assets | — | — | — | — | — | — |
574,000,000
GBP
|
— |
532,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Assets | — | — | — | — | — | — |
10,664,000,000
GBP
|
— |
10,966,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||
| Issued capital | — | — | — | — | — | — |
80,000,000
GBP
|
— |
80,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — | — | — | — |
5,980,000,000
GBP
|
— |
6,594,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Share premium | — | — | — | — | — | — |
319,000,000
GBP
|
— |
318,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves | — | — | — | — | — | — |
23,000,000
GBP
|
— |
13,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent | — | — | — | — | — | — |
6,402,000,000
GBP
|
— |
7,005,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests | — | — | — | — | — | — |
45,000,000
GBP
|
— |
67,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
23,000,000
GBP
|
6,402,000,000
GBP
|
5,980,000,000
GBP
|
45,000,000
GBP
|
319,000,000
GBP
|
80,000,000
GBP
|
6,447,000,000
GBP
|
7,005,000,000
GBP
|
7,072,000,000
GBP
|
318,000,000
GBP
|
80,000,000
GBP
|
67,000,000
GBP
|
6,594,000,000
GBP
|
13,000,000
GBP
|
7,917,000,000
GBP
|
80,000,000
GBP
|
7,511,000,000
GBP
|
317,000,000
GBP
|
7,991,000,000
GBP
|
74,000,000
GBP
|
9,000,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||||||||
| Non-current provisions [abstract] | |||||||||||||||||||||
| Non-current provisions | — | — | — | — | — | — |
42,000,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current payables | — | — | — | — | — | — |
4,000,000
GBP
|
— |
17,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities | — | — | — | — | — | — |
2,864,000,000
GBP
|
— |
3,249,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||||||||
| Current provisions [abstract] | |||||||||||||||||||||
| Current provisions | — | — | — | — | — | — |
30,000,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables | — | — | — | — | — | — |
348,000,000
GBP
|
— |
306,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities | — | — | — | — | — | — |
1,353,000,000
GBP
|
— |
645,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — | — | — | — |
4,217,000,000
GBP
|
— |
3,894,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |