Right of use of assets - Narrative (Details) - GBP (£)	1 Months Ended			6 Months Ended
	Apr. 30, 2023	Aug. 31, 2022	Jul. 31, 2021	Jun. 30, 2023	Jun. 21, 2022
WeWork
Lessee, Lease, Description [Line Items]
Lease cancellation notification period (in days)		90 days
Soho, London, UK
Lessee, Lease, Description [Line Items]
Lease term			2 years
Operating leases, noncancelable term			24 months
Operating lease, monthly payment				£ 136,200
Refundable lease deposit			£ 136,200
Denmark Hill, London, UK
Lessee, Lease, Description [Line Items]
Lease term					5 years
Operating lease, annual payment				£ 180,000
Second Soho London, UK Lease
Lessee, Lease, Description [Line Items]
Lease term	2 years
Operating leases, noncancelable term	24 months
Operating lease, monthly payment	£ 130,000
Refundable lease deposit	£ 156,000