An electrical machine comprising: a stator comprising a plurality of axially adjacent generally annular laminations , the stator having a radially inner surface and a radially outer surface and including: axially extending stator teeth at one of the radially inner and outer surfaces of the stator , between adjacent pairs of which are formed axially extending stator slots , at least one of the stator teeth including an axially extending cooling passageway through which a cooling fluid flows in use, and cooling fins at the other of the radially inner and outer surfaces of the stator ; a stator winding with a plurality of first endwindings at a first axial end of the stator and a plurality of second endwindings at a second axial end of the stator , the conductors of the stator winding being received in the stator slots ; means for circulating cooling fluid through the cooling passageway to cool the stator ; and means for circulating air around the outside of the stator , around an air cooling circuit that extends: past the first endwindings , from the first axial end of the stator to the second axial end of the stator axially past the stator teeth at the one of the radially inner and outer surfaces of the stator , past the second endwindings , and from the second axial end of the stator to the first axial end of the stator axially past the cooling fins at the other of the radially inner and outer surfaces of the stator ; and where the circulated air is cooled by the cooling fins at the other of the radially inner and outer surfaces of the stator . a stator comprising a plurality of axially adjacent generally annular laminations , the stator having a radially inner surface and a radially outer surface and including: axially extending stator teeth at one of the radially inner and outer surfaces of the stator , between adjacent pairs of which are formed axially extending stator slots , at least one of the stator teeth including an axially extending cooling passageway through which a cooling fluid flows in use, and cooling fins at the other of the radially inner and outer surfaces of the stator ; axially extending stator teeth at one of the radially inner and outer surfaces of the stator , between adjacent pairs of which are formed axially extending stator slots , at least one of the stator teeth including an axially extending cooling passageway through which a cooling fluid flows in use, and cooling fins at the other of the radially inner and outer surfaces of the stator ; a stator winding with a plurality of first endwindings at a first axial end of the stator and a plurality of second endwindings at a second axial end of the stator , the conductors of the stator winding being received in the stator slots ; means for circulating cooling fluid through the cooling passageway to cool the stator ; and means for circulating air around the outside of the stator , around an air cooling circuit that extends: past the first endwindings , from the first axial end of the stator to the second axial end of the stator axially past the stator teeth at the one of the radially inner and outer surfaces of the stator , past the second endwindings , and from the second axial end of the stator to the first axial end of the stator axially past the cooling fins at the other of the radially inner and outer surfaces of the stator ; and past the first endwindings , from the first axial end of the stator to the second axial end of the stator axially past the stator teeth at the one of the radially inner and outer surfaces of the stator , past the second endwindings , and from the second axial end of the stator to the first axial end of the stator axially past the cooling fins at the other of the radially inner and outer surfaces of the stator ; and where the circulated air is cooled by the cooling fins at the other of the radially inner and outer surfaces of the stator . <EOS>