In article you write:
I've been told by a UK carier that eleven digit numbers beginning 09
> are in use in Canada and diallable by the public - 1 09x xxx xxxx y.
Your carrier is quite mistaken. Canada is tightly integrated into the NANP and has the same NXX-NXX-XXXX phone numbers as the US and the small NANP countries.
As far as I'm aware, although the 09 number space /is/ used, it is
> only for internal network routing purposes and even then will still
> only contain ten digits.
You can see the actual area codes and dialing plan in use at
formatting link
If they use 09X numbers, it's buried deep in the network.
R's,
John