Some?I'd say basically all.
Elphick, Tshibola, Gollini, Hogan and McCormack,Taylor, De Laet and Lansbury have been complete failures to name from my head. I include Hogan in the list because of the cost. If he cost 1 million he'd be about what you expect from a Championship striker, try hard and run a lot.
Out of 17 signings that cost 76 million pounds only Adomah and Chester I would classify as great buys.