Any Ideas

[Rum Runner]

I have a rattle / patter on the back on the car . I have removed everything out of the boot , check with hood up and down , disconnected the ARB , checked all bushes and they were all tested on Friday at MOT while i watched . Its not on power or off power and diff bushes o.k , spanner checked all nuts and bolts on rear suspension, wheels off , fuel filter not touching or rattling and connector to fuel pump not hitting lower wishbone . Really quite stumped its only over certain kind of bump i.e the ones for slowing down into a 30mph zone. I have even jacked slightly each wheel whilst on axle stands to see if there is play when slight load but nothing . The cars has only done 22,000 miles shockers are not leaking ?. Odd !.
Even checked the boot release and made sure the boot sits on its rubber seal.

[spend]

I have had grit/pebbles in the drain/vent holes just in front of the tank ~ that bottom lip of the bodyshell just behind the diff.??

Dave

[PhilipC]

Exhaust mount catching and rattling exhaust against the bottom of the body? Small child under the offside rear wheel (you sure it was a speed hump...)?

[Bomber Denton]

Rubber worn on rear exhaust mount?

[Red V8]

It could be the shocks... albeit you say they aren't leaking. If they have air bubbles in the fluid it can sound like a mechanical knocking noise. If this is the case you would expect the noise to get quieter the longer the car is driven.

[peebee]

It could be the float in the petrol tank if it happens when the tank is low on fuel - mine rattles to remind me to fill up!

[Rum Runner]

Thanks All, I will check for pebbles , not the exhaust as i have been through all of that , have thought about the fuel tank sender ,i did think of it possibly being that.
I may also swap the rear shock around to see if it moves worth them . Cheers