Is it actually legal to meet HMRC alone?
Yes, there's no rule preventing you from attending a compliance check meeting without an accountant. Some directors, particularly for straightforward checks, feel confident answering questions about their own business without help, and HMRC won't refuse to meet you unrepresented.
The question isn't whether it's allowed but whether it's a good idea, and for most people facing an HMRC caseworker who runs these meetings routinely, it isn't.

