On Sat, 4 Aug 2012 20:02:36 +0100 Phil L wrote :
I may opt for upvc or timber, depending on cost.

Timber is more expensive than pvc, especially once you add on the
units, which are included in the pvc price

A third option, though you'd have to look a little harder to find a
fabricator, is thermal break powder coat aluminium. Near maintenance
free like plastic, and much slimmer like timber. More expensive
admittedly.

--
Tony Bryer, Greentram: 'Software to build on',
Melbourne, Australia www.greentram.com