Source of Roll Vent or similar ridge ventilation needed

The application is for the roof of a garden building which I am roofing in cedar shakes.
The roof is a fairly low slope (18 degrees) and the shakes are being fitted using the method at
http://www.cedarbureau.org/roofmanual/roofmanualPDFs/Roof-manual-p7.pdf
The use of felt and stand off spacers allow a good flow of air underneath the shakes.
For the ridge, I am cutting and joining two pieces of cedar the full length of the building to form a cap, angled to slope of the shakes (approx. 150 degrees).
In order to achieve a good ventilation effect through the ridge area, I want to space the cap off from the shakes with some form of vent.
The conventional way that this is done in the U.S. appears to be by the use of a special flexible matting ventilator
http://www.tamko.com/res/rollvent /
http://www.obdyke.com/html/products/inst/inst_roll_cedar.html
Needless to say, I can't find a UK supplier.
Has anybody ever seen anything like these?
Another option might be to use some form of more solid ventilator, but I haven't seen anything suitable as yet. There are soffit vents of various types, but the only ridge ones that I've found are solid and shaped to support rounded clay ridge tiles.
TIA
.andy
To email, substitute .nospam with .gl
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

These people may be able to help:
http://www.timloc.co.uk/html/roll_form_eaves_vent.html
http://www.marleyroofing.co.uk/content/165.cnt
--
www.basecuritysystems.no-ip.com
Outgoing mail is certified Virus Free.
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.