And look how long that one's been on the market for!
We're not from that part of England originally, but owned a (large, four bed, detached Arts & Crafts) house in Tettenhall for a few years. When we purchased it the property had been on the market for over a year with several significant price drops. I watched the market there for a long time and larger, higher priced properties - especially those in high council tax bands (ours was G) - did seem to take ages to shift.
We only kept ours for three years as we didn't settle in the area - and therefore didn't complete all the restoration work it required - but when we sold we actually had to take a hit on the price as despite being a supposedly desirable location, people just didn't want it.
We found that in order to achieve a sale without staying on the market for a year or more we had to price extremely realistically. If your friend doesn't need a quick sale, I guess they can just sit it out and wait for the market to improve.
I appreciate your friend's house is in better nick than ours was, plus prices have risen since we accepted an offer in late 2017, but I doubt it has increased in value that much though.