If a Will has been left then all beneficiaries will be named. If there is no Will, beneficiaries will be chosen according to intestacy rules.
During the Probate process all beneficiaries have the right to information. The executor has the responsibility to keep beneficiaries up to date with how the administration is progressing. Accounts must be kept and shown when requested.
Legal action can be taken against an Executor if the rights are breached or if the estate is otherwise mismanaged.