Rovers,
I'm attempting to rebuild my watts link in my 2000 US Spec Disco 2 w/rear air.
The three center bushings came in and out as expected (with metal sleeves on the bushings) -- But for the love of god use a "shop press" - it makes it so much easier.

The rub is the "outer bushings" or "Track Bar bushing" -- Part number RGB100970G (not there is a RGB100970 - which I believe is a LR OG part)
https://www.roverparts.com/suspensio...gs/RGX100970G/

These bushings have a plastic sleeve instead of metal, and it seems like maybe a teflon coating.
For the life of me I can't get it in to the arm of the watts link.
I put a caliper on the OLD bushing that came out, the New bushing, and the hole in the Track Bar Arm, and it does not make sense:
Old Bushing: 43mm
New bushing: 44mm
Track Bar opening: 42mm

what is the trick here? I've tried 'chamfering" the track bar opening (as a video suggested)
Help!
Thanks!

Edit: I called Atlantic British and they confirmed that the correct bushing is 44mm. So I have the right part!

I'm using this video for reference:

 

You can see the radius arms move in your video. I did a similar front-end rebuild as you, and mine didn't go away until I did the arms. If you haven't, I would replace the tie rod ends too even if they look OK. Made a big difference in handling for me.
Now if I could find a shop to do a decent alignment! I've been to 4 shops already and there are always issues.