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How can I fix the noise in the cistern?

When I flush the toilet the pipework in the cistern makes a dreadful groaning noise. The plumber has looked at it twice and changed the taps in another part of the house - within a day the groaning noise was back - what's causing it?
C. Griffiths, October 2012
Check that the plastic water feed pipe has not split

T. Kelly, October 2012