On 19/01/2014 11:45, Capitol wrote:
The bit I haven't understood is why a roofing company hasn't come
up with a solar panel roof? Or have they? I can't see the case for
drilling holes to install panels on top of roof tiles/slates.

They shouldn't drill holes.
They have brackets that go under the tiles/slates and then attach to
channels that hold the panels.
Unless they break a tile/slate the roof will be just as effective after
as it was before.

You can get solar tiles which replace tiles ans/or slates and form the
actual roof. Only really suitable on new build or new roofs.