TICKOVER when cold / slight rattle from clutch .

[ADE 2]

2013 K13 micra 1.2 30th edition. DONE 61.000 MILES . Bought 2 yrs back ex owner had complete clutch kit fitted & 58.250 miles last 2 yrs i now up 61.000 miles . noticed recently & idle slight rattle if u dip clutch goes away , realese clutch on tickover out gear slight rattle now again . HAVE invoice complete clutch fitted 58.250 miles cost £275 + fitted £250 £525 total + vat . SURELY not worn in just 2 yrs , 3000 miles ????. ALSO when cold idle sits just under 2000 rpm . 1800. go for run when warms up sits & normal 850 rpm . weird one . BEEN regular serviced new plugs fitted 60.000 air filter , oil & filter pollen filter