I can eventually see that the relationship between the constituent parts of the UK (plus Gibraltar) will not be the same in 20 years time compared to today.
With the concept of devolution, I felt that back in 1997 that there should have been an option for Wales to eventually upgrade from an Assembly to a Parliament when the time is right. I am aware that Plaid Cymru have more or less remained static in terms of vote share and constituencies held the last time I looked at the voting figures, so would probably not made much difference if Wales does ever upgrade to a Parliament.
Expanding further regarding devolution, I felt that to do it properly, the same should apply to England. The England Assembly/Parliament should sit in Birmingham, so as to make the representatives more accessible. This would leave the Westminster Parliament solely dedicated to UK wide issues as a whole, with the number of MPs reduced there. Maybe Westminster could be like the devolved administrations and finally move to a proportional representation electoral system should if an England Parliament be set up?
There does seem to be a democratic deficit across the constituent parts of the UK, with Northern Ireland, Scotland, London, Gibraltar, and other towns and counties across England voting to remain as a member of the European Union. I felt that when the EU referendum (and the 2014 Scottish independence referendum) were announced and legislated for, that for any fundamental changes to happen (whether Scotland leaves the UK, or the UK to leave the EU), the result has to be a minimum of 75% in favour of Yes or Leave respectively so as to make it a meaningful vote, instead of what we have today of both results being very narrow margin.
Regarding the democratic deficit in Scotland, you only have to have a small snapshot over the previous 40 years or just under that to see that Scotland does not get the government that it votes for, which I will detail below.
1979: Voted mainly Labour. Got Conservatives
1983: Voted mainly Labour. Got Conservatives
1987: Voted mainly Labour. Got Conservatives
1992: Voted mainly Labour. Got Conservatives (only just due to the late swing)
1997: Voted mainly Labour. Got New Labour, which they were not new, and were most certainly not Labour at all.
2001: Voted mainly Labour. Got New Labour, which they were not new, and were most certainly not Labour at all.
2005: Voted mainly Labour. Got New Labour, which they were not new, and were most certainly not Labour at all.
2010: Voted mainly Labour. Got Con-Dem coalition. Furthermore, with the exception of my constituency Glasgow North East (2005 was the Speaker Michael Martin, who stood as "The Speaker seeking re-election") changing to Labour, all of the other 58 constituencies remained exactly the same as the 2005 election. This meant that David Cameron, Nick Clegg, Gideon George Osbourne, Ian Duncan-Smith, etc had no mandate to impose "austerity" measures on Scotland.
2015: Voted overwhelmingly SNP. Got Conservatives (only just, due to the polling errors).
The pattern above is quite plain to see in that from 1979 to the present day, despite however Scotland votes to represent it at Westminster, it does not get the government it has voted for.
To round off a lengthy post, I would favour progressive federalism across the UK, with the option of Northern Ireland being returned to the Irish, and getting rid of the requirement for elected representatives to pledge allegiance to the monarchy.