Most roofing suppliers don't stock 180mm lead because not many roofers will pay the extra couple of quid for it over 150mm, personally I started roofing with a large company that prides it's self on a quality job and even as far back as the late 80's it was standard practice for us to use 180mm lead for soakers, this is something I have continued to do and to be honest I find the 150mm a bit narrow but I guess this is just what you get used to. here is a link to a site selling 180mm code 3, not associated to me just showing you all it is available off the shelf.
http://www.roofingsuperstore.co.uk/product/code-3-180mm-x-6m.html
Cheers
Steve.
http://www.roofingsuperstore.co.uk/product/code-3-180mm-x-6m.html
Cheers
Steve.
