What's fair when you have two kids at uni but one has bursaries / grants / lower cost living accommodation than the other? Meaning that before parental support, one child is thousands of pounds per year better off?
Give them both the same amount and let them get on with it? The "disadvantaged" one will just have to work more hours in their part time job / and or get an overdraft.
Or try and even it up some how, meaning that one child might get more financial support from parents than the other?