Not like it is in the UK. Most other major economies have several big cities. We really only have London, nothing else comes close. Germany for example have no city as big as London but Birmingham is our 2nd city and they have Rhine-Rur, Berlin, Munich, Frankfurt, Stuttgart, Hamburg & Nuremburg which are all bigger than Birmingham economically. Obviously, having major cities that spread out means the more rural places around them are closer to a major city and so perform economically better as well.
We have a major problem with the UK being so London-centric.