Yes, Canada has a little more than half the population of Great Britain but I would guess that in ten or fifteen years, we will have passed G.B. in that regard.
Absolute RUBBISH. Your population is growing by around 0.88% each year. Britain's population is around twice the size of Canada's, which means Canada's population has to increase in size by around 100% to reach Britain's current population.
That means, at this rate, your population will overtake Britain's population in approximately 110 - 115 years. But that's if you keep your current rate of population growth. You never know, it might slow down.
And, bear in mind that unlike other large EU countries, such as Germany and Italy, Britain's population is also growing.