or have you replace the plastic bush inside the steering rack?
It made a difference for my capri many years ago

Ok, bit of an update. Good news, sort of.

The remainder of the wobble is wheel related.

So, the front suspension is all new. LCAs inc. bushes and ball joints, tie rod ends, coil springs, swat bar D bushes and steering coupling.
I have not touched the rack, so no i havent replaced this little bush (advice on that would be good) and i havent replaced the rack mount rubbers, but they look pretty good condition.

Doing what I have done now, with the sway bar and adding the caster in, has helped, a LOT. The car steers nicely, direct, good feel, and certainly handles better.
Yes i had it aligned this morning, i didnt deal with him face to face, i had to send a mate down in the car to have it done, but speaking with him on the phone, he sounded genuine in his knowledge, and turns out he drifts falcons. He was also the only place out of 4 willing to look at the car, A on a saturday, and B without booking it in a week in advanced.

So as a result of the alignment, yes i thought it had acheived nothing. Then my mate Cal was mucking about with the wheels, (Citroen 15s) it using a feeler gauge, it appears there is about .5mm difference in the ID of the wheels, and the section of hub the wheels are supposed to sit on, ie using the shanked wheel nuts to locate. Cal managed to get the wheels as best he could to central, and bam, the majority of the wobble is gone. Which means im going to have to run hub rings in the rims, no biggy.
Now the strange part (to me it is at least) the other wheels (13" mk2 steelies) did the same thing, caused the same wobble. They were not a snug fit either. Does that mean they shouldve also had hub rings, despite being a genuine Escort wheel?

As for teying the original 12" wheels, id love to but the tyres are completely shot on them, and would not feel safe running them on the car at all.

There is also a vibration contributing to all this, which i now believe is the 2 peice tailshaft, which i know the centre bearing is on its way out.

yeah. like i said, if the tyres weren't rooted on the 12" wheels i would've done it. 
 
now just need to find some hub rings to fit. 
 
then the tail shaft will be next. the 2 piece centre bearing is dying, causing a bit of an issue also, but nothing like the wheel wobble.