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[Marks DTM Calib]

Play at the 6-12 position could be the bottom ball joint, if its the wheel bearing it will be at every position and may reduce if the brake pedal is pressed. This type of test is useless for diagnosing top mounts as the mount is not loaded with the wheel dangling as its sat on the top hat which serves no other purpose than to stop the strut falling out the strut towers when you jack the vehicle up or launch it off something whilst on the move.

[cam.in.head]

Its almost brand new, genuine GM.

                 I thought bottom arm too but he says nearly new gm ones ?

[Doctor Gollum]

Caliper bolts or carrier loose

[Kevin Wood]

Caliper bolts or carrier loose

Good call. I had one recently where the anti-rattle spring had pinged out from under the caliper body meaning the brake pad was unsupported. Cue surprisingly loud knocking / rattling sound which disappeared under braking.

[Elite_L0ver]

Very kind offer thanks, but Ive arranged to borrow some from a workmate. 

Ok buddy be interested to know what the outcome is as my steering is a little wavey n I've a knocking coming from ns also

99/100 droplinks knocking and worn bushes... bet yours is between 80 and 120k miles old

88700k ish but i have grabbed them cannot fell any play 

[Kevin Wood]

Very kind offer thanks, but Ive arranged to borrow some from a workmate. 

Ok buddy be interested to know what the outcome is as my steering is a little wavey n I've a knocking coming from ns also

99/100 droplinks knocking and worn bushes... bet yours is between 80 and 120k miles old

88700k ish but i have grabbed them cannot fell any play 

They can be surprisingly noisy with very little play evident. Also, unless the car is completely level on its' wheels they are often under some preload from the ARB, so you can't feel the play until they are off the car.

[cam.in.head]

Anti roll bar links should be ok now if you fitted new ones but test by standing by front door and push and pull on top above door severely !. This loads them from one extreme to the other and you should hear any noise. An assistant comes in handy here to feel.that will eliminate them.             To check wishbone bushes other than levering or pulling try having someone move car forwards whilst applying and releasing brake. Wheel should not jolt back and forward .rear bush of wishbone can be checked by jacking up under jacking point to let wheel hang free. .you should be able to see the bush and if tearing will be obvious. You say they are fairly new gm arms anyway. So after this check that will eliminate them.....strut top is possible i suppose but with weight of car bearing down on them and spring pushing up they are hard to test. Do they creak when turning ? Can you recreate the noise when stationary?  Does the noise stop when braking or get worse. . Hope this is of some help to you. Probably just repeated whet everyone else has suggested ! ,

[Migv6 le Frog Fan]

In my case, droplinks are a week old. Bottom arms are genuine GM refurbed with new balljoints, new GM rear bushes and new polybushes at the front. Everything wishbone related seems to be exactly as it should be, and I would be surprised if it wasn't.
Only really leaves dampers or top mounts I think. They have done well in lastingWill find out when I get spring compressors and some time off work.

[Migv6 le Frog Fan]

Having said all that - It wouldn't do any harm to check the balljoint anyway, as I could have got a duff one.
In fact I should have already done so, as to assume is to make an ass of you and me.   

[TheBoy]

its sat on the top hat which serves no other purpose than to stop the strut falling out the strut towers when ..... launch it off something whilst on the move.

So vitally important then

[Migv6 le Frog Fan]

In your case - very vital indeed. 

[Migv6 le Frog Fan]

Play at the 6-12 position could be the bottom ball joint, if its the wheel bearing it will be at every position and may reduce if the brake pedal is pressed. This type of test is useless for diagnosing top mounts as the mount is not loaded with the wheel dangling as its sat on the top hat which serves no other purpose than to stop the strut falling out the strut towers when you jack the vehicle up or launch it off something whilst on the move.

Ok, Ive just had another play. Definitely perceptible play in the wheel bearing at all positions. Pretty much disappears when brake pedal pressed.
I'm trying to narrow down the cause of the knock from this corner when going over bumps etc. without replacing everything.
To recap - ARB bushes are ok. Wishbones are GM with new GM rear bushes, new balljoints, new polybushes at the front. Brake calipers are tightly mounted.
This leaves dampers and top mounts, unless a very audible knock could be caused by the play in the wheel bearing ?
What is the best way of checking top mounts ?
If replacing dampers is I tstandard practice to replace top mounts and springs at the same time ?
I'm guessing yes for the top mounts. Springs, I'm not sure. 
Tia.

[cam.in.head]

You say anti roll bar bushes are ok ? . Do you mean droplinks ?

[Migv6 le Frog Fan]

Sorry I missed some info ou., Rubber arb bushes are fine. New Meyle droplinks a week ago.

[Migv6 le Frog Fan]

Any opinions ? Knock caused by play in wheel bearing, knackered dampers, or top mounts ?
Tia.