Rover 25 engine won't fire

Hi all, just replaced the head gasket, rocker head gasket and inlet manifold gaskets, did new plugs aswell to be sure. Now the engine won't fire. The plugs are firing I checked that, there is fuel going into the injectors and the pulleys and cams are all turning around. Am I missing something?
The engine makes a whining noise when trying to start rather than the chug chug of having no petrol, please help!!