A gutter only has one job: catch everything the roof sheds and take it to the drain. When leaves from the pines and oaks around Sandhurst, Crowthorne and Camberley combine with moss washed off the tiles and years of grit, that path closes up. Water then goes over the front of the gutter, over the back against the fascia, or out of the joints, all three of which end up on the building rather than in the drain.
Clearing gutters properly means removing the debris rather than pushing it along, clearing the hoppers and the full length of the down-pipes, checking joints and brackets, and then running water through the system to confirm it actually drains. A gutter that looks clear from the ground can still be blocked at the outlet or part-way down a pipe.
Because roofers do the work, the visit also produces useful information: whether the fascia and soffit are sound, whether brackets have pulled, whether the roof is shedding moss into the gutter because the covering needs cleaning, and whether any tiles have slipped at the eaves.