Had it to LR on Monday and they claim its the TC and they would change it for £3k
Spoke with a guy whos company deal in Auto box overhaul in cars and plant machinery.They will remove the box and overhaul for a similar price to LR and give a 2 year warranty.Also provide a courtesy car .
Have it booked in for May 2nd

Not a cheap fix but if it were mine i would only trust the view of a lr main dealer or an independent specialist in auto's. They would have both come across the fault many times, having worked a lot with vehicles fitted with auto's. You can easily get caught out with faults like this.

I have exactly this same issue with my 2010 FL2. I'm going to try cleaning/replacing the crank sensor, then I think I'll give Dr Tranny's a try and see what happens. My juddering went away for a couple of weeks after the AT oil was changed which makes me think it's not engine related but I'm trying all cheap/easy options before going too far down the TC replacement road. Does the FL2 require two 2oz tubes of Dr Tranny's?

I think the fact you have changed the ATF and a temporary removed the Juddering conludes the fault is likeley to be the box or TC.
I have changed the crank sensor for a new one and also fully change of ATF ( 7 ltr) and also added 1 shot Dr tranny and problem only fixed temporry.
Dr Tranny supposed to be good for 10 Ltr ATF I am lead to beleive .
Have mine booked in to Auto box specialist on the 2 nd May for diaognostics and removal of gear box for repair .
No faults showing when plugged in at LR dealear and they could say only think its TC.3k to change .
" Specialist " says it may not be TC and me be problem inside the box itself .