ok so as above the starter motor is very slow to turn the engine over - with or without spark plugs in!
i sourced 2 other starters and both did exactly the same.
ive cleaned up all connectors and checked earth straps
the battery is rubbish however i have used another car to aid in jumping. delivering 13v to the starter motor.
i am able to move the car in gear suggesting the motor is not fully seized.
i have also connected the starter motor, power and earth cables to another engine that turns over fine (with and without spark plugs in).
so my question i suppose is what else could be wrong?
history: i bought this car as a non runner with a possible immobilsier problem and it looks as though it may have been modified internally - could something been over torqued internally?
reluctant to engine swap if i dont have to - any ideas?
will post video later for better description.
cheers,
ryan