Diesel in starter motor

So I've had a leaky fpr for a while and now about to replace it, tried the O ring kit and that didn't work. Problem I have now is starter won't start!
Will this just be a case of dropping it out and a bit of a clean up with contact cleaener is is it fcuked?

Firstly make sure your battery is healthy.

Get a multimeter on the stater solenoid wire (Smallest one only about 2.5mm2)
Do you have 12v when starting?
If yes, starter solenoid could be stuck (give it whack with a broom handle), starter could be shagged.
If no look elsewhere, alarm/immobiliser ignition relay etc....

Hope you get it sorted, it's a fooker when problems stack up.

The batterty is fine and I replaced the solenoid in the starter last year. I think it is where the fpr is over the starter (TD5) and has been leaking onto it, it has got worse over the last week to the point now where it just clicks when you turn the ignition

Maybe not.
Took out the starter and gave it a good clean out put back together (after doing fpr) and nothing, it still just clicks! the contacts looked worn but I only replaced them last year but think this may be the cause again and may be just coincidence with the fpr leaking? so the car is now stuck on my drive and I have no way of getting it off to bump it and to top it off the air suspension has just gone down Another great day in owning a disco