But if you've understood your posts correctly, you appear to have belief that the ultimate tier of Government must be at Westminster, and you appear to be fearful of anything different, but I've not seen you provide any rational justification for that belief.
What is different about - say - French people and German people compared to British people?
You're right that I think that Westminster is 'high enough'. There are really two reasons for this:
First, I have a general tendency towards localism. I believe that mayors and councils are the most democratic structures that we have. I believe that localised decision-making allows people to feel closer to their representatives, have more visibility of decision-making and have more influence per capita over decisions.
It is not an absolute belief. Certain things like defence are clearly not local issues. I understand the anguish around 'postcode lotteries' in health spending. But generally, the lower the better. I tend to feel that harmonisation tends to develop organically on the market when it is really useful (e.g. the ubiquity of USB sockets and the shape of USB plugs). I tend to think that harmonisation for harmonisation's sake tends to have an anti-innovative effect.
On that basis, Europe is simply too far away. It is the opposite of local decision-making. People feel distant from their representatives, it covers too much ground (and over-complicates matters too much) for it to be adequately covered by media, many decisions happen privately creating vulnerability to lobbying, the influence per capita is tiny, decision cannot hope to apply well to local circumstances, meaning the circumstances have to bend to the law rather than the other way around.
Westminster is not perfect. It is about as distant from parts of the UK as you can get before it seems just that bit too far away. London is rightly considered as remote (both geographically and in other ways) from regions of the UK. But it is just small enough to be followable in the media. MPs serve small enough constituencies to be able to hold effective surgeries. The business transacted at Westminster can be covered by the media. There is enough scrutiny to expose and criticise lobbying.
On my second point, in a way I think you're right. It is not entirely rational. It is that I feel British. I feel that my neighbours on these islands are my countrymen. I don't feel that we are a superior breed of human, but I do believe in a national culture. I do believe in a national psyche. I do believe that there is something that makes us British. I don't believe that it is exclusive to people born here - I think people can become British and it's a wonderful thing when they want to. I believe that our culture is a good one.
I love the French. Really, I do. I'm going to France in two weeks and I can't wait. But I love them because they're French. I love their differences. I love the fact that France still feels like going abroad.
I'm still young but perhaps I am just old enough to feel like this. Perhaps the younger generation, who grew up with global media and internet access and smartphones from a young age feel connected to Europeans to a much greater extent. Perhaps borders and frontiers feel much more artificial to them.
I think (apologies if I'm mistaken) that you are a Conservative supporter, and your opinions have therefore benefitted from the lack of proportionality.
I'm socially liberal and economically conservative. I voted for Blair in 2001 and 2005 for social reasons and voted Conservative in 2010 and 2015 for economic reasons. I won't tie my hands for the next election as Cameron isn't my favourite politician right now!
I understand that there is no perfectly democratic electoral system. Any system is inevitably going to be some kind of compromise between representing the 'will of the people', getting a stable Government that can actually govern, and making sure that decisions are to some reasonable extent made by people have the right skills and experience to make those decisions. But, given the kinds of oddities I've just described, I think you'd have a very hard time arguing that the EU is significantly less democratic than the UK system.
FPTP is not perfect. It has advantages, including producing a Government in a country which draws its executive from the legislature. I think it has generally, with the exceptions you mentioned, tended to provide the 'right' result. I accept that this may become less and less likely in the future as the number of seats that can be described as simple two-horse races diminishes. Personally I would like us to find a way of using a more proportional method to elect a Senate as our upper house, and turn peerages into mere honours.
But I think we should realise that the voting system is only one ingredient in the quality of a democracy. (An important one, I grant you). It also includes closeness / remoteness of representatives, visibility of decision-making, appropriate level of decision-making, chosing the appropriate
demos, respecting the rule of law and constitutional conventions, direct participation of the electorate in referendums where appropriate, awareness of local consequences, and much more.