Simpson has first run-out.
Simpson showed some neat touches in the centres while full-time squad members Elliot Hodgson and Jon Molloy scored tries.
Hull FC benefited greatly from a hat trick by centre Nev Morrison as the Giants suffered a second successive defeat.
Giants: Hodgson (E), Whiteley, Fletcher, Simpson, Lamb, Ansell, Hynes, Orwell, Stead, Raleigh, Kirmond, Molloy, Sarsfield. Substitutes: Fox, Davies, Peltier, Covell-Wood.
Tries: Molloy, Hodgson. Goals: Ansell.
* QUICK OFF THE MARK: New Giants centre Jamie Simpson is in training at the Giants but had a run-out for the Under 20s against Hull FC at Laund Hill