abney park cemetery chapel, stoke newington, london, by william hosking 1840

my local victorian cemetery, its chapel of c.1840 built by william hosking, its spire a distant descendant of bloxham's. if not repaired soon it is likely to collapse; I really don't understand why quite large elder trees have been allowed to root on the roof, it's a no brainer to remove these considering the damage they do.