On Sat, 11 Mar 2017 11:51:59 +0000, F wrote:

A further thought... is it OK to hide the cable by running it in a
gutter until it reaches a position where I can put it through a hole in
a wall? Black cable against brickwork doesn't look pretty.

As Mr Aglionby suggests outside the gutter along the top of the
brackets and black cable tied to them would be better. If only to
stop it possibly trapping crap and blocking the gutter.

--
Cheers
Dave.