https://companycheck.co.uk/company/0862 ... house-data
According to this https://suite.endole.co.uk/insight/comp ... ey-limited there are only 99 shareholders so not many took up the offer of a free share. Unless these are a special class of share in some way. In which case they will be even more difficult to sell. I suspect like most of these get rich schemes they are pretty much worthless. But like imutual no harm in anyone sitting on them in hope.
https://en.wikipedia.org/wiki/Tandem_Money_LimitedCo-Founder Community
Tandem was established and built with the help of a group of customers which the bank calls "co-founders". Tandem expanded its formerly invite-only co-founder group by asking members of the public to join in April 2016 during a short sign-up window.[10] As part of becoming a co-founder, 5% of the company stock was promised to co-founders in return for helping to grow the Tandem bank community and participating in market research, but at present, the bank is still operating a waitlist for potential customers, as above.[11][12] Tandem held a crowdfunding round in May 2016[13]