I think that it must have closed.

I noticed a couple of other Derby units become Hannells estate agents  https://www.openstreetmap.org/way/126546690 in Chaddesden and https://www.openstreetmap.org/node/5405540596 at Park Farm in Allestree

The one Hays Travel listed for Derby is listed in Park Farm (not the same unit that closed) https://www.openstreetmap.org/way/104068798 but does not show on OSM  