Saint Giles is a school near from Russel square underground station where the future teachers do free english class.
On Tuesday I went to the school and ask to the receptionist for the free english class, he told me to return tomorrow at 13:15.
On Wednesday I was on the school at 13:00 and there were a lot of people, i spoke with a teacher from the school about 2 minutes and he told me that i could go to the intermediate level, but you have to go at time for to get tickets due to there are a lot of people.
The class are teaching for future teachers, and there are 3 different teachers for 1 hour each. Its funny because some teachers are nervous, but its good for the chance to listen different accents.
Good place!, i will go all week, and the ambient is very friendly.