Re: Primeval: Canada
As for the anomalies appearing in Canada now, really, I never understood why they weren't doing that all along. The original show never explained why they only opened around England and particularly London, except for the usual conceit of British sci-fi that London is the center of all things. I suppose maybe they were some kind of "aura effect" of Philip Burton's work, concentrated around the place and time where he created his thingamabob and extending around it both forward and backward in time. But they never really addressed that.
It's more likely an issue of budget and the final two seasons were filmed in Ireland anyway, But then it's just as unlikely to see Daleks attacking LA or Chicago for the same reason.
The greatest science fiction series of all time is
Doctor Who! And I'll take you all on, one-by-one
or all in a bunch to back it up!"
--- Harlan Ellison, from his introduction
to the PINNACLE series of Doctor Who books