Help diagnosing a problem

hi guys, just looking for some help diagnosing a problem. I first noticed a slight lag whilst I was driving over a month ago but it seemed to go away. Then I was doing 65 on motorway and put clutch down to change gear and the whole car started vibrating (I've since noticed it also does this when I stop accelerating not just when clutch is down). There is large clunks when I change gear, whistling coming from below when I accelerate and also humming when I accelerate, anyone got any ideas?
09 110 tdci with 51k on clock

Uj's on a propshaft would be my first place to look. Chock the wheels and jack a wheel up with the handbrake off and check for any movement on the propshafts. Also take a look at the state of the panhard rod bushes on the front axle

Marmaduke said:

Uj's on a propshaft would be my first place to look. Chock the wheels and jack a wheel up with the handbrake off and check for any movement on the propshafts. Also take a look at the state of the panhard rod bushes on the front axle

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There's slight movement in front prop rotating, no side to side or up down movement, rear prop is solid

There will be a certain amount of rotational movement but there should be no up and down movement. If in doubt remove the whole thing and engage the difflock and take it for a spin

Just followed the steps you described and found a lot of play on rear prop, tried to remove it but one of the nuts is rounded

Get the grinder out - cut it off.

9/16" socket is what you should be using. Where abouts do you live cos if you're local I've got a proper removal tool and a couple of spare nuts