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When you checked the voltage at the head terminals, did you have the machine running and the handle reclined? Power is only applied to the head when the machine is reclined.
Anyone got any other thoughts or ideas as to what my problem could be, or am I some weird outlier?!
reset switches do fail, but in your case i would suspect the head motor is at fault if the reset is tripping.The body of the switch( if it's the white version) may be browned and will smell baked.Bypassing the reset switch may prove a point but you could end up destroying the rectifier / pcb in the head assy as the motor runs, draws excessive current with no protection.You have a voltage 230v at the head terminals so presume the yoke cable is ok, these can go open circuit intermittently - but that will not cause the reset to trip. Replace the head motor, it's a consumable part and they all fail - not hard to do other than being a little fiddly, stu posted a video on it in the dc25 department.