I would guess it goes the other way, as all the forests in England seem tragically small compared to those in Canada. British Columbia alone has about thirty times the amount of old-growth that all of England does.

Wiki>"Only 3,090 square kilometres (760,000 acres) of ancient semi-natural woodland survive in Britain – less than 20% of the total wooded area. More than eight out of ten ancient woodland sites in England and Wales are less than 200,000 square metres (49 acres) in area, only 617 exceed 1 square kilometre (250 acres) and only 46 are larger than 3 square kilometres (740 acres)."

>"There are about 11.1 million hectares of old growth forest in B.C. Old growth forests make up about 20% of B.C.’s publicly managed forest areas." https://www2.gov.bc.ca/gov/content/industry/forestry/managin...

I don't think it's that surprising that a large, sparsely populated country has far greater quantity of this type of land than a much smaller, more densely-populated island.