TheOddOne...
I believe that there is a slight misunderstanding of terms. The Canadian AIP is more closely related to your UK AIM (and ours is changing to an AIM this fall).
That being said, it has taken a long time for the document to be added in an electronic format and I hope that the "new" AIM will be available on the web as well.
Is the UK AIM available online? I have only been able to locate retailers that sell hard copies for £16.95, such as AFE:
AFE Flight Information Guides
Aside from the AIP, almost all publications here are also available online:
Canadian Aviation Regulations
Transport Canada's Publication Storefront
Now, if they could just come up with a half-decent search engine so that you could actually
find what you're looking for on the site TC site...
