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Be very careful with wooden double glazing, it's often badly designed and leads to the double glazed units 'blowing'
Can you not design this out by using plant on muntins / glazing bars like Mumford & Wood sash windows, for example? Granted they don't look exactly the same as a trad sash window but I think most people would be hard pushed to tell the difference.
Prole.
@Airhead
Sash Windows. I've been paying around £900 for sash windows from the London Sash Window company where I'm replacing sashes in loft extensions. I usually specify wood effect pvc as it looks a bit more natural. The installation is where most companies let themselves down and the guys I use are not that great either, I'm always able to tidy the finish up when they've left but generally these guys just want to get in, rip the old windows out and bosh in the new ones as fast as possible. Most of the materials and methods they use to achieve this finished result at speed are sub par in the medium to long term.
Generally the cost of refurbishing and weatherstripping a sash window is around £900, I've known them to cost more if the entire window needs stripping to the wood, i.e. all the glass removed and replaced with new putty. You may also have to pay a little more if you want the surrounds renovated too. That cost usually includes the inside of the sashes. Quite often sash windows are not in as bad condition as the owner thinks. I usually remove the sashes and replace with ply wood, then the windows are renovated/painted in a workshop, it means no need for scaffolding and access is only required from the interior.
Be very careful with wooden double glazing, it's often badly designed and leads to the double glazed units 'blowing', there are lots of technical reasons for this but the repair market hates wooden double glazed units. I've repaired lots of these units and they are very often a dogs dinner, of course I get to see the worst ones as they are the ones that need repairing! If you do decide to have wooden double glazed sashes, make sure you keep up the maintenance, especially the sealant between the glass and beading, if that seal breaks down or the beading rots the double glazed unit usually blows in short order.
I don't know anyone else that does the job the way I do in other areas, they are bound to exist but like me they probably have a business based on word of mouth or recommendation. I have had clients wait 3 years to have me renovate their windows because they have seen my work locally. Normally I get round to it faster than that!