However, if you've dealt with that fact, and still want to at least find out about going to Britain, here are some really helpful student websites.
UK Council for International Student Affairs
Great site. It has basic information about absolutely everything, immigration, working during or after your degree, fees and funding, getting credit for your non-UK schooling and experiences, contry-specific information (including a link to the Canadian Bureau for International Education), language and culture information, and even more than that. You absolutely must go to this website if you think you want to study in the UK; you're a fool if you don't!
Universities and College Admission Service: Non-UK Students
This is the central place for applications to UK Post-Secondary schools, and while you'll find very little precise detail here, they do have some helpful information about what, in general, to expect and do if you are a non-UK citizen wanting to study in the UK.
VisitBritain.ca
This is just the general UK Tourism website for Canadians, but if you aren't interested in anything you can find here, you probably shouldn't be going to the UK, unless it's the only place in the world that has your program. Even if you don't want to, I'd still recommend that you go here, because tourist information is always useful, sometimes even in your home country, and you'll be a fool if you go live in Britain (or any other foreign country) and don't do any touristy things.
Find a University or College Course
This is intended for UK residents, but you can use it too, and unless you know exactly where you want to go and what you'll be studying already, you'll probably want a resource very much like this. Because we've all heard of Oxford and Cambridge (or if you haven't, why are you at this site at all?), and maybe a few other places, but regrettably, the historic and glamourous schools are also the most expensive and hardest to get into, and if what you mainly want is the UK, or some particular part thereof, you'd be well advised to at least look at some other places.
UK Visas: Students
Here's where you go once you're past the what-if stage, and have honestly applied and been accepted to a UK school. This is a site for visas, and visas only, and you will have to go here sooner or later.
Need2Know Learning: Further Education
Need2Know is the UK's hip site for teenagers, and this is the Higher Education part. It has details on surviving Freshers (Frosh or Orientation) Week, checklists for stuff you should know and take, and information about the kind of stuff people starting college or univeristy need to know, like how the profs. may not actually notice or care whether you're in class or not, so it's up to you to do the required stuff all by your independant adult self. If you aren't more or less straight out out high school, this is like reading the college tips in Seventeen; kind of nostalgic, but really funny, and maybe a bit embarassing. However, we all need this kind of stuff before we become world-weary second year students, and it'll cut down on the culture shock if you use this site as well as Seventeen or whatever your particular poison is.
Border and Immigration Agency: Entering the UK
This is a step-by-step description of the process of legally entering the UK (step 1: present passport, etc.). It's hardly a vital document, but it is nice to have if you haven't crossed enough borders to feel really comfortable with the idea, and it does explain some things that can be confusing, things like exactly who has to fill out which forms.