The following sentence in combination effectively says "because you said Montreal and Quebec were anglo, your other statements are null and void".
Anyway, I wouldn't say the UK growth is totally organic, and I don't mean to say suspect in a Clinic sense, because there have been a handful of specific factors that have come together that's created this lightning in a bottle rapid expansion of the sport in the UK.
The first is the British Olympic failures back in the 90s that led to the lottery funding, and the specific targeting of sports with a lot of available medals, of which track cycling is obviously one. This meant that, at least in respect of the track, strong talents were getting nurturing and developing to a level they previously hadn't got. Following that, once the Olympic successes had captured the nation's imagination in Beijing, there was the ongoing project to take the same approach to road cycling, because that's where the majority of the money in pro cycling is.
Then, you have the emergence of Mark Cavendish. Cav is one of those guys who had the talent that means he would have emerged and got to the top level regardless, but his success outside of the Olympics came at a currency - Tour de France stages - that the general public understood. Cav, along with the riders familiar to the public from the Olympic program, gave many Britons who previously wouldn't have done a reason to watch cycling, and get to discover it.
There is also the timing being extremely good for them - Beijing and Cav's emergence coming almost directly off the back of Operación Puerto, Freiburg and Rasmussen completely decimating the German cycling audience, with sponsors pulling out, races being cancelled, TV coverage halted, and so on. From the Wiedervereinigung onwards, with the progress of Team Telekom and T-Mobile, Germany was a very sizable market that suddenly fell away massively, an audience and market that the UCI, race organizers and sponsors were keen to replace, and the previously little-tapped British market blossoming shortly afterwards gave a huge opportunity to soften that blow, especially with some of the traditional markets (in particular Spain but also Italy) suffering economic downturns that were hitting the profit margin hard.
This also coincided with the return of Armstrong, which reinvigorated the US market, and the late-career blossoming of Cadel Evans which helped invigorate the Australian interest which had been there for a while but not to the extent it became. With late-career Armstrong being a crapshoot, ASO's decision to neuter many of the Tour's mountains until late on in order to ensure Lance was in contention because of the extra eyeballs it gave them also benefited Wiggins of course, who suddenly vaulted into being a stage race contender. In the following couple of years you see an increasing number of races - especially the ASO ones - that consciously favour Anglophone riders, with changes to the Tour points system to favour Cavendish after he missed out on the maillot vert a couple of times, and stage races heavily biased in favour of the time triallist (particular offenders of course being Paris-Nice 2011 and the Tour 2012) and with a larger number of fairly consistent grinder's climbs rather than steep or inconsistent ones.
This has of course changed wholesale and gone completely the other way now, but then the British Tour contender par excellence is Froome, who didn't come through the track program and is a completely different type of cyclist to those produced by it. At this point, the base has been energised and there are a number of British riders coming through the system who aren't going through the track scheme (whereas riders preceding that, like Dan Martin, had to go through a number of hoops if they weren't aiming for the track, or riders like Jamie Burrow - probably the most naturally talented British male climber since Robert Millar, at least at the time - who had to go it alone), as well as there being teams outside of that base who are looking at British young riders (Hugh Carthy going to Caja Rural, for example). For a couple of years though, it was as if ASO and UCI were quite consciously and clearly trying to engineer routes to allow for as much British success as possible to build up that audience. Now that audience is there, and pretty established (see the crowds on the roads for the Tour de Yorkshire, silly name notwithstanding, and the Women's Tour), they no longer need to do that. As an added bonus, time has healed the wounds in Germany and the country's starting to get back into the sport again. If there is a Clinic scandal on a big enough scale, hoewver, the British scene is not as ingrained as in traditional countries where the sport's events are enough of an institution that they will plough on regardless, and as a result it may be hit hard in the way the German one was from 2007-2010 when it seemed to be suffering a slow, painful death though, and will need to be careful to ensure that it can rebound (what would be worse, the pro events survive but the amateur and national calendar events will die off, choking the progress of young riders).