Other than your course fee, you would require enough money to support your living expenses. You need to have this money for minimum 28 days. This period must be within the 31 days, when you apply for your VISA.
The Living cost of London and its 32 boroughs is estimated 12006 GBP, i.e., 1334 GBP/ month for 9 months
The living cost outside London and its 32 boroughs is estimated, 9207 GBP, i.e., 1023 GBP/ month for 9 months.