Bank of Scotland - Student Current Account
right at the bottom, fourth paragraph from the end:
'If you have an arranged overdraft you must pay your salary, grant cheque, student loan, parental contribution or other regular credit into your account.'
is where i saw it.
i had a friend who was accused of 'abusing' her overdraft, i'm not sure how they worked out she wasn't paying her money in though. also, i don't know where the £400 per quarter (assuming it's got anything to do with this rule) came from, never heard of that before.