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Ventrolla will replace shagged out old sashes with new double glazed wood ones and repair the boxes for ~£1k per window (with decent discounts if you have many windows).
NickCJ-
The guy I used charged £300 (plus 5% vat) for refurb or £1,100 (£800 at 20% vat and £300 at 5% vat) for new hardwood double glazed (the quality of the hardwood ones was way above some others I had installed).
At some point I'll probably try and work out the impact (my thermostat has loads of data to download but I got a loft conversion at the same time which complicates things).
Having windows that smoothly open and close is a big bonus though.
aggi
An option I'd be looking at is having your existing sash windows overhauled. It's not that pricey if they're in ok condition and it will hugely cut down on draughts.