Clutch fork won't clip back in.

Thanks guys for your advise.
My answers for your questions are -
Yes- I have the little clutch fork return spring, it's a new genuine one.
No - I don't have the overcentre spring, it was missing when I bought the car, but I will order one today.
It did have a Borg and beck clutch in the car when I first bought it, but it was trashed.
I now have p/N 88503hdx ram clutch kit.
I was very careful not to hang the gearbox so I tilted the front of the motor up and used a couple of jacks and the box went in without any problems.

I will check out those links and see if I can see anything I missed.

I'll also look into the clutch fork bracket.