I think the thread went off track a little. But anyway, here's a perspective I've got.
I went to law school, didn't become a lawyer but lots of my friends continued that root.
Law is marketed as a "safe option for hard workers, with clear and simple objectives". Corp lawyers tend to have scored top marks routinely their whole life. So when one gets released/fired it comes as a big surprise/shock. A friend of mine, Oxbridge on 300k GBP pa (not even partner) got fired and just couldn't understand it. But that DOES happen in law. Often thro no blame on the person who was fired.
Its just people were never told this in law school.
I never saw the post as looking for legal advice, because its not really a legal issue. More of one about personal pyschology and the practical side of career. Ofcourse the op can get legal advice easily.
But there are other questions. Esp if you look at his other post where he was working on a business while being a lawyer. The fact the woman has only been his boss 2 weeks really stinks of shit.
And considering "revenge" is just a natural human process. Some of it call that "justice" or "getting closure". Then there's the issue of whether claiming unfair dismissal makes sense from the career pt of view as opposed to legal pt of view. Often lawyers will only look to make money and actually HARM their client with unnecessary litigation. And employment law is sometimes too specialised for lawyers in other sectors to make good assessments on.
I don't know whether Syd should look at an unfair dismissal claim or any Law Society(regulator) issues, because I don't know the facts re performance. However, as the he was able to get an admirable business income as a "sideline" its clear he has a passion and talent in business.
Whether he should pursue that full time, and never look back at the law, well I don't know. Perhaps he should join a smaller firm (less work expectation) or even work as a part time lawyer somewhere.
But ultimately, I don't think he should worry about the situation. Because he has two very good options - business and continuing law for now. AND a mixture of the 2 at once.