Here's the thing though - Lambeth Council don't monitor their trees (either in parks or elsewhere) very well, so there's a public safety issue throughout the borough regarding unsafe trees. The big cedar on Tulse Hill only getting inspected - and felled - after it had shed branches onto the road being the most local example to me. Lambeth are big on "too little, too late". Just on my estate alone we have four trees undermining homes, but will Lambeth authorise root-pruning? Will they fuck!
It's also not the best time of year to work on trees, as I'm sure "Lambeth Landscapes" are aware. Doing so taking commercial matters into consideration, is pretty pathetic.
BTW, branch-fall casualties are more common than people think. Kew Gardens put out an advisory about 10 yrs ago, after a death there (female tourist). They attributed the increased frequency to changing weather patterns, & increasing cycles of heavy sunshine combined with very heavy rainfall. Apparently this "shocks" some trees into shedding their larger branches, so it's not only disease that's a problem.