New Largo Owner - Need advice on drive shaft

[dtuyi]

Hi everybody,
My name is David, I bought this Nissan Largo Highway star about 2 months ago before I had to travel abroad hence I'm only just starting to use it.
I was informed about the knocking noise when the wheel is turned before I bought it, I've been told that its the front driver's side shaft, its a diesel with 4 wheel drive I believe.
I've seen some brilliant information here on the forum, but I'm still stuck as I don't know of any mechanic who is sure of what to do with this.
I live in Rainham, Essex and bought it in order to take family trips abroad with my family.
for starters I read somewhere that the front shaft can be disconnected as this will improve MPG, I don't mind losing speed as its a family car if this will work.

[Hutch]

You can go to rwd however, you will find that the knock is still there. The cv joint must be connected for the brakes to work correctly, I would just get the garage to replace the offending joint and run as designed.
Hutch

[N.r.g]

Tell garage the cv joint is the same as Nissan primera. Count the splines to match.