He did ask Durham. But admissions just said it was a standard offer for a Scottish student.
This was all last year and he did achieve. AAA and is now very happily studying at Oxford. 
Here is Durham's response to his query regarding the grade requirements:
Our current offer criteria for students studying within the Scottish system is:
Scottish Advanced Highers - AAA. This is the equivalent to A*AA at A-Level.
We do not make offers based solely on Highers.
Please note that we review our offer criteria yearly.
UCL were even worse than Durham (see below). They required A star star (not even a grade at A level) A star A star. Needless to say, he didn't apply there.
Thank you for your email. While I appreciate our grades may be very high, the grade requirements are A*AA for A-levels and this has been determined as the following for students taking Scottish qualifications
Advanced Highers: Advanced Highers grades A1,A,A
Advanced Highers/Highers: Advanced Highers grades A1,A plus Highers at grades A,A,A
Advanced Highers/A-Levels: Advanced Highers and GCE A-Levels at grades A*AA/A1AA.
These grades are used across UCL and for all courses with the same required grades. The LLB Law is an incredibly competitive and oversubscribed, with over 3,500 applications for just 175 places, and as such the grade requirements are set high.