Are there any sizeable ethnic English or Scottish minorities in countries not colonised by the UK, or was there any sizeable emigration to those places in the past? Are there English pride parades in these countries, like there are with other migrant populations, like the Irish, Italians, etc?
I know that in Argentina and Uruguay that there were British engineers and such that helped built the railways, and as such there's a scattering of British surnames around (e.g. Hector Cuper, Sebastian Coates). I'm also aware of the Welsh settlements in Argentina.
You know, I could be wrong but I can't actually think of any examples of this. I think that during the age when peaceful migration really took off - the nineteenth and twentieth centuries - Britain ruled over a large section of the world and a lot of other places were either rival powers or had been taken over by rival powers. This means that the chances of a British person wanting to emigrate to a non-British colony were quite slim. Add to this the fact that for much of this period Britain was the wealthiest and most advanced economy in the world (taking away the economic motive to emigrate), and there really weren't many reasons to move.
Good question.
Check out Lomas de Zamora, Buenos Aires, Argentina. A few months back I randomly visited a cemetery (forget the name though) that was FILLED with English (and German, Italian and even Ukrainian/Russian) surnames. Fun fact: Johnny Ramone apparently had a child with a girl from Lomas and lived here for some time.