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Then the solenoid will not do anything and the diode and Mosfet will get very hot. Your power supply might blow up.Actually you are quite right and after rewiring it the heating has decreased a lot and I think it may have been due to my having connected the Solenoid's Diode the wrong way round?!
The source is at +24V and the gate when the Mosfet was loaded was at +15V. But the drain was at +1.1V instead of very close to +24V so the backwards diode was shorting the load.how did you calculate the 9 volts between the gate and the source?