Someone will make them if your pockets are deep enough. ( try http://www.northoltglass.co.uk/projects.asp they did the monster one on grand designs ) 2.6 isn't very big.
Schuco , aliplast etc. lots of alli profiles out there that can be made to suit.
Same with wood options . Have you tried Greensteps.co.uk

Have you read this thread?

http://www.greenbuildingforum.co.uk/forum114/comments.php?DiscussionID=11975&page=1#Item_10

Posted By: woodgnomeJames. Have you used Greensteps before as im thinking of using them for my doors and windows as they gave me a good quote.

No . Had a few quotes. Others here have and I believe they were happy

I had fitted 2 sets of Sunflex this year. Awful sealing around the edges, actually let rain in.

They were in 2 different clients places, the worst was the non-double glazed frameless type (8mm shop glass). The double glazed ones weren't as bad but I won't be fitting them again. What we've been doing since is using normal sliding patio windows with a frame much larger than the opening. The frame is fixed to the inside against the wall and then we build another stud partiton in front of it, so in effect you have patio doors that slide into the reveal. Worked very nice.

Hi Archmoco and everyone else,

Thank you for your responses. I was really keen for bifolds but after a fair amount if consideration I opted for velfac sliding doors. There maximum height is 2450 so I am short by about 7cm. I'm not too worried as I'll fill the void with insulation. The external is cedar cladding so it should be fairly straightforward to make the opening smaller.

The main factors that swayed me were as follows
1 cost - the bifolds were more than double the price
2.the sliding doors are easier to fit
4.better seals esp with regards air permeability
5.we have a step down into the garden so are not able to have a flush threshold.
3.simpler visual appearance given size of opening.

I'm hoping I have made the right decision. If the opening was bigger like yours, then opening the whole reveal would certainly be dramatic.
Now need to figure out the specifics of filling the reveal gap to ensure it's air tight.
Thanks

Divorcingjack,

I think Mine was around £6.5k, it was a fixed price for all the windows (15k), but very happy with the windows and doors and they seem to be airtight, certainly during the blower test there was no indication of air leakage. The guys are back next week to do the flashings and cills (and remove the tape)

Archmoco, is that house on the Belfast side of Saintfield by any chance? If so it always catches my eye as I'm driving past:-)

Archmodo, thanks very much for your photos and pricing info regarding the Internorm. I went back to the dealer today and was very impressed by the engineering and general handling of the doors.

How tall are your doors? We are looking at an oversize (height-wise) slider but can't work out if it is an indulgence or actually a practical option.

Small practical note ...
The design of what you chosse might deal with this but:
if either of your two walls with the openings take a strong hit from wind, consider putting the opening section on the outside. I've had to retrofit a vertical sealing strip where the two sections meet in the middle when the slider is closed.
For both practical and aesthetic reasons we have our slider on the inside.
When the gale blows it pushes the moving section away from the fixed section.
It's only 2mm maybe but thats enough to let the gale/cold in!
(BTW its "lift & Slide" 3G wood 2700mm by 2100mm and was £3000 from Albo)

<blockquote><cite>Posted By: woodgnome</cite>Mike did you get any joy from Albo regarding the draught problem?</blockquote>

No, but I probably didn't try that hard as,

a) I saw it as poor design on my part as opposed to a fault with the door.
b) because I was distracted by the fall-out associated with breaking my wrist.
c) it was potentially going to take up a lot of time I didn't have.
d) I thought of a way to fix it ...

They're the single most pricey item on the whole build.
I could have done with a more local, and therefore more accessible, solution (not least to keep the fuel-miles down) but at the time I couldn't find one that wasn't even pricier.
Going by a couple of threads I expect if I looked around now there would be one.