Spent five years in the UK after 15 years practising from home, neither native nor perfectly fluent but understood the place and have found my own voice. I can

Spent five years in the UK after 15 years practising from home, neither native nor perfectly fluent but understood the place and have found my own voice. I can even produce non-trivial poems ehehe. If you need business level only, you don't need to be fluent, just proficient within your field of expertise so grammar, pronunciation, daily vocabulary and deep into your industry slang. Good luck!