Is 800£ a month enough to live off.Watch this thread
Assuming that you are single with no dependents, generally healthy and able to cook most of your meals- you should be okay.
Try to save at least £150 a month.
Work out a monthly budget that you will stick to for your groceries, takeaways, boozy drinks, clothes, nightlife and other favourite hobbies.
Be very wary of buying expensive technology items, special event tickets and restaurant meals.