What is the best way to get access to a LLM?

I think I‘m not the only one who doesn’t quite understand that question. Querying Google, “LLM” seems to be an unambiguous three-letter abbreviation: https://en.wikipedia.org/wiki/Master_of_Laws, which says:

“A Master of Laws (M.L. or LL.M.; Latin: Magister Legum or Legum Magister) is an advanced postgraduate academic degree, pursued by those either holding an undergraduate academic law degree, a professional law degree, or an undergraduate degree in a related subject. In most jurisdictions, the "Master of Laws" is the advanced professional degree for those usually already admitted into legal practice.”

I can’t think of a situation where it wouldn’t matter whether your LLM would be an expert in British tax law, North Korean tax law, or British criminal law, so given your “I am not picky which one”, I don’t think that’s what you mean.