Thanks for that Deejay.
I think I am up for a new inner clutch housing on this one because the pin is flogged at the end and it easily came out of the housing. I did notice prior to pulling it down that it was making a knocking noise on the shaft when I was trying to start it and there was a fair bit of back and forward movement (10-15mm).
Damage is very similar to your experience as my cotter and engine shaft key look the same as yours did when you removed them.
Will order the parts from the online store shortly.
Regards,
Craig.