On 15/03/2012 09:39, Lieutenant Scott wrote:

Is there a way to stop a radiator going bang bang bang (well quieter
than a bang) when it heats up?

Probably due to movement against its mounts as it heats up and expands.
The mounts should normally have little u-shaped bits of plastic fitted
to support the radiator, to prevent metal-metal contact and enable the
rad to slide freely and noiselessly as it expands.

David