An interesting film is here which looks at just one of the issues which has arisen due to the existance of a Scottish Parliament with no equivalent English Parliament. The webpage seems to lock out firefox users, unfortunately. The film looks into the issue of higher education in Scotland.
The issue of inbalance in the UK is an important one, without balance the UK is fundamentally flawed, and inbalances can only increase with time. As things stand now, the issue isn't critical for many people. It should not be allowed to become so.
The issue with the film isn't that Scottish students get more perks than English students, it's in the fact that Scottish MPs were voting on English issues which they knew would not backfire at home. If an English parliament decided to continue with the difference in outcome that would be a different matter.