I get a huge payrise in January and it's going to leave me about £650 per month better off (after tax)
I'm terrible for living beyond my means and getting into debt.
I want to be able to use this extra income from the start in the way I mean to go on otherwise I will end up spending it all each month as I currently do 

I will have £1500 spare each month after all bills including food and petrol etc.
How much should I save? Should I use separate accounts for things? I really could do with tips!