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Deferred Shares (Details) - GBP (£) £ / shares in Units, £ in Millions	Jun. 30, 2026	Dec. 31, 2025
Equity [Abstract]
Ordinary shares, liquidation preference	£ 1.0
Deferred shares, nominal value (in gbp per share)	£ 1.00	£ 1

X

- Definition

Face amount or stated value per share of deferred stock.

+ References

No definition available.

+ Details

Name:	brns_DeferredStockParOrStatedValuePerShare
Namespace Prefix:	brns_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of liquidation preference on ordinary shares to be paid after which the deferred shares have the entitlement to receive out of the assets of the Company.

+ References

No definition available.

+ Details

Name:	brns_OrdinarySharesLiquidationPreference
Namespace Prefix:	brns_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration