how can i fix my peugeot partner 1.9d?

i have an intermittent starting fault on vehicle. cheked several times over last 3 months and by wriggling wires at starter motor it normally starts; but last night it woul not. carried out basic checks and came to conclusion starter was faulty (checked with test light to see if solenoid wire was being fed from ignition switch it was). left vehicle over night, went to it this morning unlocked it put key in and vehicle started straight away and has started 15 times since. anyone got any ideas please ??