The above is not quite correct, the link is for an immigration lawyer, they wont give the correct information cause they want you to hire them to work for you (and they get paid even if you get rejected), check the real government of Canada website below. Also there is no special treatment for applicants from the UK when applying for permanent residence.
One can not simply decide to move to a new country. You have to apply based on your situation. If you are trained in a specific trade, apply under the Skilled Worker Class. If you were to get married she could sponsor you to become a permanent resident (Family Class). But there is no special provision to allow someone to enter Canada (legally) simply because they want to.
If you have any more specific questions i can help out, i worked for Canada Customs and Immigration for 6 years.
CIC Canada | Immigrate to Canada