Strange banging / knocking.

[TomLS]

Recently, my moggy has developed a strange rpm-related rattle/knock/bang when travelling at low speed.
When idling in neutral, if I place my foot flat on the floor, I can feel something banging irregularly against the chassis somewhere.
At higher rpm's the noise isn't there (or just can't be heard?).
I've tried looking under the bonnet and I can't isolate the source of the sound, it sounds a bit like a loose fan blade banging a metal part, but my fan is bolted on tightly.
It has increased in severity since last weekend's 370 mile round trip to V-Festival in Staffordshire (which she handled without serious complaint )

Has anyone had a problem like this before?

Thanks in advance,
Tom.

[bmcecosse]

Worn out clutch thrust bearing/problem with the clutch pressure assy (release plate out of true)/gearbox input shaft not held securely in the crank tail (ie bush missing or disintegrated\) - or just the exhaust banging against the body - or the trolley jack rattling about in the boot.......

[TomLS]

I think the noise is a bit too metallic to be the gearbox input shaft.
Now that you mention clutch plate being out of true, I did notice today (for the first time) a judder when I pulled away a more sharply than usual at a roundabout - perhaps the clutch cover bolts could be loose?
I had thought about and checked the exhaust banging, but can't see anywhere hitting and the noise still occurs.

Thanks for the reply

[MarkyB]

Does it only happen when the car is moving?
I check that the master cylinder bolts have their heads toward the torsion bar, they can touch it if the other way round.