Don't know what you are going to see in Nottingham, Glasgow, Manchester or Birmingham. They are good for overnight stay though. Hotels in those big cities are not expensive and whide choice.

It will be Edinburgh Festival at that time. Hotels might be very expensive there. You can either stay there to enjoy the atmosphere or go on a three or four days tour to Highlands.

After condensing the days in those places, you might find you got more days around London in the end. Go to explore SE England, such as Brighton, Canturbury, Dover or Southampton. Lots of places to see in those places and easy to get to.

去年去过英国，行程也很急，我觉得你可以去掉几个地方，在几个地方走的缓慢一点。你路上的行程时间呢？

其实英国大部分城市玩一天就够了，倒是伦敦可以多待几日。格拉斯哥和曼城去旅游的时候路过，没有怎么细玩，不过感觉工业城市氛围比较浓，个人不是特别喜欢。另外同意沙发的回复，建议多去英国南部逛逛，。Brighton是个不错的海滨城市，很干净，适合度假。我就在Southampton读书，城市不大，倒是没有什么特别的景点可逛的，不过从这里可以坐船到怀特岛（或者在portsmouth坐船近一点）Isle of Wight 倒是听说很漂亮，我也一直想去玩来着。

谢谢楼上的好心人们。你们说得挺好道理的。。
我们正在修改行程中！