Rough running / hunting

[speedwell 1]

Hi all please see this video https://youtube.com/...k303-mNPWUXcLA. Any ideas what this rough running /hunting may be. It started after I jump started the car with a jump pack. Was running fine before that. Now the starter bendix is firing but not fully engaging. I'm currently thinking of checking earths, then dizzy innards, points condensor etc, then the Voltage regulator which is a sold state positive earth, any advice appreciated