I noticed this too. If London is 0.65% of the UK's land area but houses 15% of the population, surely the policy should be to reduce density not increase it.
There are a lot of "stats" in this report which are skewed to support the author's argument, e.g. calculating the capacity of a golf course at 72 at any one time, I would expect max capacity of 2x4balls on every hole = 144. Little things like this add up over the whole picture portrayed in the study.
when Lewisham Council were consulting over the closure of Beckenham Park GC they would go down there late afternoons in the winter when the course was empty to back up their claims that the course wasn't used. they had no interest is keeping at as a golf course after they were offered several million by the Lottery fund to turn into a park. they even refused to sell to David Lloyd group