Why are we British NOT very united?

This is typical of many so called 'united' nations and kingdoms. Different 'united' states of america for instance, they're all americans but still have issues with each other due to laws and finances. I'm from London (a southerner) but live in yorkshire. I constantly debate with friends the differences in social and cultural behaviours and these are all English. Still a divide and no border has been crossed. I think it's human Instinct. Territory! That said, you can't blame some people for disliking the way things are done. For instance, you and I have to pay for prescriptions and if our families want to go to university, they have to pay extortionate amounts of money. In Scotland, they don't pay for prescriptions and the new university charges don't count to Scots. All tax money goes into and gets drawn from the same pot so how is that fair. This aside, I was born and bred in england but have both Irish and Scottish family. We do remain the UK regardless.