Right of use of assets - Narrative (Details) - GBP (£)	1 Months Ended		12 Months Ended
	Aug. 31, 2022	Jul. 31, 2021	Dec. 31, 2022	Jun. 21, 2022
Lessee, Lease, Description [Line Items]
Deposit payable			£ 0
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
Annual lease payment			£ 180,000
WeWork
Lessee, Lease, Description [Line Items]
Lease term	12 months
Lease cancellation notification period (in days)	90 days