The pay averages around $130-$140k canadian dollars. 90k GBP is about $140k CAD, which is about the same. A specialist makes around +$300k, a surgeon over $500k. Also it's about what the alternatives pay for a doctor. Becoming a specialist isn't that much more work, but pays significantly better. Also you can do equivalent work as a GP doctor working at walk in clinics / urgent care and get paid significantly more in the same city from the same healthcare system than being a traditional family doctor. It's kind of obvious why you don't have any family doctors with that kind of financial incentive system. The ones that do it do it out of inertia or really like being a family doctor for non-financial reasons.
Another special thing about the UK although is the amount of schooling needed to become one and consummate expense and risk seems significantly less. You can enter doctor school after high school and be in school for a significantly less amount of time. If you don't get in, you can move on with your life and go do something else with nothing really spent time wise or financially.
In the US/Canada, you need to get at least %75 of an undergrad, hope you get accepted into a graduate doctor school, which is extremely competitive, and then work you ass off in a very high workload situation, and then you need to do residency where your paid below minimum wage if you do an hours worked calculation, in a system designed by a doctor with a literal cocaine habit before cocaine was made illegal. Your in your 30s when you can start making proper money.