If you're concerned about money and that much short for accommodation you shouldn't be getting an ensuite room unless you need one for medical reasons, it's just plain silly and money you don't have down the drain.
As for how much I spend per month:
food: £100
socialising or eating out: £40
Toiletries: £5-10
Miscellaneous (replacement clothes, treats ect) £40 on average
Travel (not paid monthly, pay £120 in September and £120 in January. Covers transport for most of my duration at uni.