I have found the disco great for green laneing but no good for going as some one put it down holes (quarry open days) i begrudge spending money on it to improve it further and i wont recoup the costs, were you can with a 90. plus after seeing what a 90 could do and go where i could not it showed me the light of a 90.
I am no expert but I would advise that you ask someone that knows what they are looking for to go with you as I didn't and I have had to shell out a lot for not doing it properly.
ang on a minute folks. my mates got an F plate with a 200tdi fitted as standard. so maybe its not the TD as mentioned previously. it to has a salisbury rear axle with disks.