What is the best way to improve my communication skills?

I am a non-English native, I came in the UK 1 year ago and I am fluent in English.

I just would like to improve my written and verbal style, to make it more professional because nowadays, employers are very demanding regarding communication skills.What is the best way to improve my communication skills?
Ther r many commnication skills courses/seminars conducted by professional. It is usually for 2-3 days %26amp; it covers written %26amp; oral communication. Search in Google with location for instiutes conducting the same.