Looking for something maybe a bit less well-known.
DC has previously read, (and enjoyed) things like the Famous Five. Currently absolutely absorbed by the Adventure books by Willard Price (bit dated, about catching wild animals for zoos).
Quite likes Just William.
Has read the first two Harry Potters, but was not especially enthused - not that keen on magic and fantasy.
Probably more preference for fact-based, animals, historical type stuff - but perhaps something to expand the horizons would be good.