Based on the details you've provided, here's a refined introduction that you could use: "Experienced English and Business Teache

"I am an experienced English and Business teacher with over 10 years of teaching experience across various educational levels in Nigeria and Mexico. Holding degrees in English and Literature in English, I bring a wealth of knowledge and a diverse teaching background to my students. Currently based in Manchester, I offer tailored lessons that cater to the needs of my students, focusing on enhancing both their English language skills and business acumen. My approach is interactive and adapted to the cultural and individual differences of learners, ensuring practical and theoretical understanding.