Ok, thanks for the info.
Second option (because im not throwing away money on a car thats done nothing but give me grief)
did a burn out up my lane as wanted to show off before getting new tyres, i drove it pretty hard for that day too, and then when i was driving nice and slow and sensible the circlip must of gone (speedo still goes up when revved).
Iv ordered a new circlip and washer, is it a big job to get the thing welded in? as im sure the diff needs to be taken out to do so.
if i go down the renfort plate route how much of a job is that to get the holes drilled etc
(trying to establish the cheapest and less hastle free route for the gearbox shop)
btw all of this will be carried out by my local gearbox shop as i dont have the time to do these big jobs not with my work