In which case Agustien as the worst. I thought we'd had Bridcutt longer than four years, my brain is getting old, so can I just change my answer to what HKFC said above?
If we're including loan signings
Best - Bridge, Upson, Vicente, Ince all for different reasons. Ward was a pretty good signing too.
Worst - (oh dear, here we go) Rodriguez, Harley, Obika, Agustien (for temperament mainly), Barn Door Billy, Dobbie