We've just had 10metres of bi-fold panels installed, 1 run of 5metres and a corner of 3x2.
I agree completely with the other comments:-
- Definitely go with Aluminium (available in a range of colours)
- Don't pay more than 1k per metre panel.
- Larger the door the better, ie: 2 x large doors better than 3 smaller doors.
- Integral blinds are a matter of choice, we looked at these and decided they weren't for us - prefer the clean lines
I got my doors from 1stslidingfoldingdoors,...
http://www.1stslidingfoldingdoors.co.uk/ and would highly recommend them. They have a showroom in Middlesex and obviously supply all over. As you would expect, doors comply with FENSA and are guaranteed for 10years.
You can see a pic of the back of our extension here,...
http://www.knightprojects.co.uk/
Cheers.