Savings in London

Hey guys, I'm getting a job in London with compensation of £96k with office located in central London. How much can I save in pounds if I have a decent lifestyle ? Decent lifestyle includes a 3 person shared apartment in a moderately expensive neighbourhood, once in 2 months trip to Europe, non drinker or smoker (I heard drinks cost a major chunk).

Any other advise to save money would be really helpful.