Unfortunately there’s not a lot of consistency when it comes to registering charity bank accounts. Some insist on a registration number. Others might just request a governing document. The problem is, these rules change, so spend a bit of time researching your options. Remember there are specialist charity banks (e.g. CAF Bank, Unity Trust Bank) as well as high street banks out there.
If for whatever reason it is not possible to register a bank account in the charity name, your Treasurer may consider opening a personal one, but do so separately from any other he or she may have. If possible, facilitate two signatures to sign cheques. Additionally (but certainly if the latter cannot be done) make a statement to the other Trustees to the effect that the Treasurer holds money in Account X on behalf of the charity, and to leave that statement with them