If you are left out of someone’s will there are two realistic courses of legal action. You can try to claim that the will is invalid. This is only going to be a viable course of action if, by invalidating the will, you stand to receive something from...
Every UK company is required to identify the people who are 'persons with significant control' (PSCs). Essentially, PSCs are the people who own or have significant control over the company. Their details must be lodged with Companies House. Surprisingly, although the relevant requirement came in in June 2016, more than 57,000 British companies have not yet identified their beneficial owners.
If Companies House decides to enforce the requirement, the results could be dire for directors who fail to comply as it is an imprisonable offence.
The GOV.UK website provides information on how to identify the PSCs in your company.