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ChainBreaker
Sash windows can be restored and weatherstripped for about the same price as replacing with DG. They should last 8 years before needing another coat of paint on the exposed areas. Replacing a cill is about 1/2 days labour but most window specialist will use epoxy resin to repair windows in situ these days. I'm a specialist in restoring sash windows but only work in SW6, Mayfair & Richmond!
Please think about retaining sash windows and restoring them, partial restoration can still be very durable and weatherstripping stops them rattling and makes them easy to open and close and improves acoustic insulation. DG units in wood should be avoided (unless they are premium products properly installed by experts), anything in PVC will lose it's looks over time.
I usually only recommend DG in roof extensions where they are less visible and access for maintenance is difficult.
Heavy acoustic lined curtains are a good way to cut down noise and heat loss.