Either (i) or (ii) depending on hardwood/softwood, spring counterbalance or corded and the type of glazing supplied (i.e. single large pane or individual panes and also super thin or standard DG units). Fundamentally a basic not too large softwood counterbalance 4-pane sash set, unglazed, primed should run out at £325 to £375 (at least that's what I paid last time I had some softwood ones made). Hardwood, depending on species, should put £50 to £100 on that, although the sill for a softwood window should in any case should be in hardwood these days to meet current standards. Another possibility is to ask about the use of recycled pitch pine, which whilst nearly as expensive as oak these days is extremely hard and very durable and should be available in Yorkshire as it is recycled from mill beams. If going for traditional counterbalance weights insist on midfeathers (these should be made from something like HDPE or the like so they don't rot) which prevent the weights from banging into each other as the sashes are raised and lowered. On upper floors consider paying extra for a
sash access kit, (sometimes called a Simplex System) which will allow you to swing lower sashes on upper windows inside for cleaning - both safer and easier. Not sure what the glazing will cost - there are too many variables in there for me to say.
In general when I'm doing these it's a case of refurb rather than replace - conservation and all that - but the main area of failure is the sill. Other things where people go wrong is not to paint their windows for years and years (not good) and to let decorators get away with painting any brush strips in (if that happens they'll need replacement - see Mighton link above or try
Reddiseals). Oddly enough windows painted with old-fashioned chalk-, lead- or oil-based paints seem to survive much better than those finished in modern alkyd paints - so it may be worth looking at paints such as
Holkham Paint (now called Precious Earth)
The cost of installation? I'd work on a rate of 2 to 3 windows a day for a man and lad. Hacking out the old windows is incredibly messy and when the new ones go in the reveals will need to be boarded out and replastered, unless your building has shutters, in which case the job will possibly take a bit more time.