Is DOS & Co. a bank?

No. DOS & Co. is a registered payment service provider. Under its FCA permissions, it can carry out all services enabling cash to be placed on a payment account as well as all operations required for operating a payment account. For the Cash Deposit Manager, however, DOS & Co. works as your bare trustee, opening an account on your behalf and in your name at the Bank of London, which stores your funds unencumbered at the Bank of England.