Assuming we're talking about a career as a solicitor in London.
Agree with what Emmings has said - a "good" university is an important tick box on the application to move you through to (hopefully!) interview stage, but don't obsess over individual global uni rankings, or where *exactly* a university sits in a ranking table.
From a typical recruiters perspective in a large london law firm, any russell group (or similarly well regarded uni) more than ticks that box. You do not need to go to KCL if you want to work in such a firm firm (including the MC), Leeds, Sheffield or Cardiff will stand you in roughly equal stead. I went to uni in the north at a comparable uni and many of my peers went into MC/SC training contracts. Recruiters are looking at your whole CV, a commitment to law, relevant work experience, confidence & performance at interview. They are not looking at precise uni rankings.
I would recommend picking the university you like the feel of best, what course content you'll think you'll enjoy the most, and the city that you think you'd enjoy studying and living the most in. I live and work in London now but definitely enjoyed being in a much smaller city as a student.