In the end the Chancellor didn’t pull any rabbits out of the hat on corporation tax. There wasn't an announcement about rate changes and there are no specifics on anti-avoidance measures for multinational companies. There may be further announcements in the draft finance bill, but for the moment it will be business as usual for most corporates.
The continued devolution of taxes within the UK will need to be watched by businesses whose operations straddle more than one of the UK’s countries. Compliance burdens are likely to rise as businesses have to deal with Scottish income tax, Northern Ireland corporation tax and potentially devolved Welsh taxes.