Who regulates them and where is it regulated?
I would've considered this but it doesn't sound much more reassuring than Crypto Capital.
https://www.interest.co.nz/business/98363/resurrection-how-etana-custody-ltd-company-whose-ceo-major-shareholder-has-never-been
I think I'll wait until you have real and direct GBP banking.
It's regulated in New Zealand by FMA but there isn't any license or special regulation needed in the country. The company just need to register in a directory (the FSPR). (That was the case with the old cryptopia too) that's what I understood from your link.
Since some people have been waiting for deposits in USD for a long time, they will be very pleased I guess