Had a look at these townhouses a couple of weeks ago. They are all occupied except for two unfinished. As you commented earlier the back gardens are postage stamp size. I went back on Sunday when a show house is supposed to be open but there was no one there.
I can't believe they have sold for anywhere near the asking price while similarly priced detached houses have not sold. The location is one of the worst in the area because of constant traffic noise. My guess is they have quietly rented them. This seems to be confirmed by the fact that no sales are recorded on Nethouseprices.