When turning the steering to full lock i can feel slight juddering through the steering wheel?

The mechanical stops for the steering may not be correct, OR it is 'normal' and because the wheel is turned so far the inside tire is really scrunched. Also try increasing the tire pressure to the max in the manual

the brakes have not been set properly. may be something stopping the pistons going back in. failing that the disc's are bent, can happen when over braking down hills etc. you would need the alinement checking.

sounds like the gear box or sterring rack went out have some one move the wheel look see what is moving and wha tis not

Assuming the steering wheel is not turned all the way to full and there is an excessive load on the lock cylinder, it sounds like the cylinder has failed.
You may have to get a locksmith or mechanic to take the column apart and drill out the cylinder.

while you SLIGHTLY turn the steering wheel, try to turn the key-do not force the key, you do not want to break it.

Your steering wheel lock may have your ignition lock cylinder in a bind. Try to move the steering wheel. If it moved back and forth a couple inches freely, this is not your problem. If it does not move freely, then turn it with moderate force to "feel" where the lock pin is. It will move slightly in both directions. Move the wheel so it is in the center of this small amount of travel and turn the key. It should turn now. If this does not work, then you may have to have your steering column disassembled to have the lock cylinder replaced.

HI,
is the vehicle on a full steerring lock left or right?
Apply the parking brake, Trans in P / N.
Insert the ign key.
Place one hand on the rim of the steering wheel and "rock" the wheel as you attempt to turn the ign key. You will feel the pressure against the steering wheel, keep "rocking" it and it should unlock as you work the ign lock.

Good luck.

Jack up the front of the car and spin the wheels by hand. Try to look for a point behind the wheel and see how the tire runs, if you see it go up and down, you have deformed tires and you will have to change them. Also look at the inside of the tire for hernias (lumps) on the side wall of tire, if so, change the front tires. Do this check on the rear tires also. Have a nice day!

you may need a new power steering pump