Right of use of assets - Narrative (Details)	1 Months Ended					9 Months Ended
Right of use of assets - Narrative (Details)	Aug. 31, 2022	Aug. 31, 2021 USD ($) ft²	Feb. 28, 2021 GBP (£)	Nov. 30, 2019 GBP (£)	May 31, 2019 ft²	Sep. 30, 2022 GBP (£)	Aug. 01, 2022	Jun. 21, 2022	Jul. 31, 2021
Eastbourne Terrace, London, UK
Lessee, Lease, Description [Line Items]
Annual lease payment				£ 780,000
Refundable lease deposit				£ 130,000
Lease rental relief			£ 32,500
New York, NY
Lessee, Lease, Description [Line Items]
Net rentable area \| ft²					200
Lease cancellation notification period (in days)					30 days
Soho, London, UK
Lessee, Lease, Description [Line Items]
Lease term									2 years
Refundable lease deposit						£ 136,200
Operating leases, noncancelable term						24 months
Operating lease, monthly payment						£ 136,200
San Francisco, CA
Lessee, Lease, Description [Line Items]
Net rentable area \| ft²		2,526
Refundable lease deposit \| $		$ 20,000
Operating lease, monthly payment \| $		10,000
Advance rent upon lease execution \| $		$ 9,000
Denmark Hill, London, UK
Lessee, Lease, Description [Line Items]
Lease term								5 years
Operating lease, annual payment						£ 180,000
WeWork
Lessee, Lease, Description [Line Items]
Lease cancellation notification period (in days)	90 days
Lease term							12 months