John Rumm coughed up some electrons that declared:

Tim S wrote:

Other Tim: Something like that might work - as you can see in the picture
outside, the gutter does provide a fair degree of guarding against direct
exposure to rain. The louvred vents might just finish off a well placed
slot.

Just found:


http://www.smartmarine.co.nz/louvre-...vc-p-1459.html

- don't know if there is a UK supplier. but would be dead easy to fit
loads with a holesaw...


I think I;ve seen those somewhere in the UK.

Oh - it was these

http://www.klober.co.uk/product2.php?id=39

and they're not as good...