Disclosure Of First-Time Adoption [Text Block]

HEADLAM GROUP PLC - Filing #1587521

Concept	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31
Disclosure of first-time adoption [text block]	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Disclosure of comparative information prepared under previous GAAP [text block]	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Disclosure of comparative information prepared under previous GAAP [abstract]
Disclosure of comparative information prepared under previous GAAP [line items]
Equity	4,900,000 GBP	175,900,000 GBP	100,000 GBP	—	1,500,000 GBP	—	232,100,000 GBP	—	—	—	53,500,000 GBP	—	1,700,000 GBP	4,300,000 GBP	—	—	158,800,000 GBP	—	1,500,000 GBP	—	4,300,000 GBP	—	—	5,900,000 GBP	7,700,000 GBP	53,500,000 GBP	220,000,000 GBP	—	—	—	100,000 GBP	—	6,800,000 GBP	53,500,000 GBP	245,100,000 GBP	500,000 GBP	186,000,000 GBP	6,100,000 GBP	100,000 GBP	4,300,000 GBP
Comprehensive income	—	—	—	– GBP	—	– GBP	—	– GBP	– GBP	6,000,000 GBP	—	– GBP	—	—	16,600,000 GBP	22,600,000 GBP	—	19,600,000 GBP	—	– GBP	—	– GBP	20,500,000 GBP	—	—	—	—	– GBP	900,000 GBP	– GBP	—	– GBP	—	—	—	—	—	—	—	—