Im doing MA Eco from IGNOU,i want to be a teacher,there is a course Msc diploma in ECO, offered by LSE,should i do dis or go for the b.ed !

I m doing MA Economics form ignou, my ultimate goal is to become a teacher, few days back i came to know about a college named ISBF which is offering Msc diploma in Economics affilated from LSE, which is quit expensive, so i should go for the b.ed or do this diploma from London school of Economics !