They tell their office is in China. Its adress is mentioned on the FCA website.
https://www.fca.org.uk/news/warnings/freewallet-wallet-services-limited-freewalletorg
But I am sure this is a fake office, no actual workers may be found there
There is some information about possible owners, for example Gunyashov, potential founder of this scam had a company in the UK https://find-and-update.company-information.service.gov.uk/company/08348416/filing-history
But I am also not sure whether this adress is actual.