I have just received my new QTechnology power supply but the motherboard connector is 24 pin when the website states it is for 20 and 24 pin, is this correct?

The QTechnology PSU incorporates a splitter into the 24-pin ATX connector. This makes it possible to remove four of the 24-pins making it 20-pins. If you look closely to one end of the connector you will see you can slide 4-pins off.