They use providers like KN Group, but their installers will always throw cables over the roof, tack them to surfaces, take the easy route. They blame insurance cover stating they are not allowed to go into attics or chase cables.
This makes sense in terms of potential damage to air tightness membranes, hitting pipes or cables, but my suspicious mind also wonders if the time required to do a well routed job is a significant factor. Electricians are very familiar with spending time routing cables properly, so you might find a local one to take this on.